Every Sunday, you open ChatGPT and start over. You paste in your family size. You explain the dietary rules again. You remind it about your youngest's food texture issues, your budget, the fact that Tuesday nights are short. You've done this 40 times. It still doesn't know your family.
There's a fix. It's called ChatGPT Projects — and it means you do this setup once, and never again.
This guide walks you through exactly how to build a permanent family dinner system inside ChatGPT Projects. By the end, planning a week of meals will take two minutes, not fifteen.
The problem with re-pasting your rules every week
Here's what most mums experience with AI meal planning. The first session is great — you get a full week of dinners that actually fit your family. Then next Sunday you start a new chat, and ChatGPT has forgotten everything. So you paste in the household rules again. And again the Sunday after that.
It's not a big deal. Until it is. When you're tired on Sunday morning and meal planning feels like another chore, that extra ten minutes of setup is enough friction to make you skip it altogether — which sends you straight back to the 6pm "what's for dinner?" spiral.
ChatGPT Projects solves this entirely. You write your household rules once, save them inside a dedicated Project, and from that point on every conversation in that Project already knows your family. No re-pasting. No re-explaining. You just open the Project and start planning.
What ChatGPT Projects actually are
ChatGPT Projects is a feature — available on paid ChatGPT plans — that lets you create a named workspace with permanent custom instructions. Think of it like a separate, specialised assistant who already knows your context and remembers it between every session.
A Project has two main parts:
- Custom instructions — a block of text you write that tells ChatGPT everything it needs to know about your household. This is always active, in every conversation inside the Project.
- Conversation history — all your chats inside the Project are saved and linked. ChatGPT can refer back to previous sessions if you ask it to.
You're not building an app. You're not coding anything. You're writing a text document that describes your family, and saving it to a workspace. That's it.
Not on paid ChatGPT? No problem — you can still get most of this benefit on a free account by saving your household profile in a text file and pasting it at the start of each session. It takes 30 seconds instead of 10 minutes. Or use our complete guide to AI meal planning for free-account strategies.
Step-by-step: creating your Family Dinner project
This takes about 15 minutes the first time. After that, you never do it again.
- Open ChatGPT and make sure you're on a Plus or Team plan.
- In the left sidebar, click "Projects" (or the "+" icon next to it).
- Click "New Project" and name it something clear — "Family Dinners" works well.
- Click "Add instructions" or "Customize" inside the Project.
- Write your household profile in the instructions box (use the template below).
- Save it. From this point forward, any chat you open inside this Project has your instructions active.
- Test it — open a new chat inside the Project and type "Plan this week's dinners." You should get a plan that fits your family without any extra explanation needed.
That's the whole setup. The magic is in what you put in those instructions.
What to include in your project instructions
Your instructions are your household profile. The more specific you are, the better every single future session will be. Here's what to include:
Family size and composition
Who's eating? Adults, kids, ages. "Family of 4: two adults, one 8-year-old, one 5-year-old." This affects portion sizes, complexity, and cooking time assumptions.
Dietary rules
Any allergies, intolerances, or dietary choices. Be specific. "No tree nuts. One adult is dairy-free. No pork for religious reasons." These rules apply to every meal the AI plans.
Ingredient quality standards
This is where most people skip a step — and then wonder why the AI keeps suggesting packet sauces. Tell it explicitly: "We eat whole, minimally processed food. No artificial colours, flavours, or preservatives. No ultra-processed convenience products. Real ingredients only."
Picky eater details
If you have one, be specific. Not "fussy eater" — that's too vague. "My 5-year-old won't eat mushrooms, cooked tomato chunks, or anything with a visible sauce. She'll eat smooth sauces. She eats pasta, rice, and most proteins."
Weekly budget
Give a specific number. "Weekly dinner grocery budget is approximately $100–$120." This shapes every meal suggestion.
Time constraints
When can you cook, and for how long? "Weeknight meals must be under 40 minutes. Sunday I can batch cook for up to 2 hours."
Favourite and disliked meals
List 3–5 meals your family loves and 2–3 they hate. This stops AI from repeating the same suggestions and ensures it builds plans you'll actually use.
The prompts that now just work
Once your Project instructions are set up, your weekly prompts become very short — because all the context is already loaded. Here are the three prompts you'll use most often.
The weekly planner prompt
This is the one you'll run every Sunday. It's short because your household profile does all the heavy lifting.
Plan 5 dinners for this week. This week's notes: - [Any produce to use up, e.g. "use the zucchini before it goes off"] - [Any nights that are shorter than usual, e.g. "Thursday is sports night — needs to be 20 mins max"] - [Anything you feel like, e.g. "I'd love something with chicken"] Output: meal name, main ingredients, prep time, and a brief note on why it suits our household.
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That's it. No re-pasting your family size, dietary rules, or budget. The Project already has all of that.
The grocery list follow-up
Run this immediately after you've approved your weekly plan.
Generate the grocery list for this week's meal plan. - Group by supermarket section: produce, protein, dairy, pantry, frozen - Include quantities - Flag items I probably already have in a standard pantry - Keep it within our usual budget I already have on hand: [optional — list anything you want to use up]
The household profile setup prompt
Use this to write your Project instructions in the first place. Paste it into a fresh ChatGPT chat (outside your Project) and fill in the brackets — then copy the output into your Project instructions box.
Write a household profile for a ChatGPT meal planning Project, using these details:
Family: [describe your family — size, ages]
Dietary rules: [allergies, intolerances, dietary choices]
Ingredient standards: [e.g. whole food, additive-free, no packet sauces]
Picky eaters: [specific exclusions and preferences]
Budget: [weekly dinner grocery budget]
Time limits: [weeknight cooking time, weekend availability]
Favourite meals: [3–5 meals the family loves]
Meals we avoid: [2–3 meals nobody likes]
Format it as a clear, structured block of instructions in second person ("You are planning meals for..."). Keep it under 300 words.
Want a ready-made prompt pack to pair with your Project setup?
Grab the free prompts →From 15-minute setup to 2-minute weekly planning
Here's what changes once your Project is live.
Before: Open ChatGPT. Start new chat. Paste household profile (2 minutes). Explain dietary rules (1 minute). Mention the picky eater again (30 seconds). Add budget reminder (30 seconds). Add time constraints (30 seconds). Finally run your planning prompt (1 minute). Review and adjust (5 minutes). Run grocery list with all the same context re-pasted (3 minutes). Total: 12–15 minutes, and you're probably tired by the end of it.
After: Open your Family Dinners Project. Type your weekly planner prompt with any notes for this week (30 seconds). Review the output (2 minutes). Run the grocery list prompt (30 seconds). Done. Total: 3–4 minutes, and the first two minutes are just reading.
That's not a small difference. That's the difference between meal planning being a friction point you avoid — and being something you actually do, every week, without thinking about it.
Want to go even further? Meal Planning OS takes this same principle and builds a complete system around it — with pre-built instructions, weekly prompts, and a structure designed specifically for families who eat real food. It's built on the same Projects framework, but the setup is already done for you.
What to update over time
Your household profile isn't static. Life changes, and your Project instructions should keep up. Here are the things worth updating:
Seasonal produce shifts
At the start of each season, add a note about what's cheap and in season. "Winter: root vegetables, citrus, brassicas are cheap. Avoid stone fruit." This keeps your meal plans aligned with what's actually affordable at the shops.
New picky eater phases
Kids change. A six-year-old who refused all sauce might accept bolognese by age seven. Update the exclusions when something shifts — otherwise you're planning around a restriction that no longer exists.
Budget changes
If your grocery budget goes up or down, update the number. Don't leave a stale figure in your instructions — it affects every meal plan.
New family favourites
When a meal becomes a family hit, add it to the favourites list. The AI will return to it more often and build variations around it.
A good rule of thumb: review your Project instructions at the start of each new season, and any time something real changes in your household. It takes five minutes.
ChatGPT Projects vs Claude Projects: which is better?
Both ChatGPT Projects and Claude Projects work on the same principle — save your instructions once, apply them to every session. But there are real differences worth knowing about.
ChatGPT Projects
Well-established, reliable interface. The Projects feature is mature and straightforward to set up. Conversation history inside a Project is easy to navigate. Works well for structured weekly planning. Requires ChatGPT Plus (US$20/month).
Claude Projects
Claude's Projects feature works similarly and has comparable instruction capacity. Many users find Claude produces slightly more natural, varied meal plans with less tendency to repeat the same meals week after week. Claude also handles complex dietary constraint combinations well. Requires Claude Pro (US$20/month).
Which should you use?
If you're already on ChatGPT Plus, use ChatGPT Projects — there's no reason to switch. If you're starting fresh and primarily care about meal planning quality, Claude Projects is worth trying. Both are meaningfully better than using the free tier without saved instructions.
For our full breakdown of the two tools — including which handles whole food constraints better — see our complete guide to AI meal planning.