One dinner, two preferences.
Keep the main work shared, then make room for different tastes without cooking two complete meals.
Separate preferences from requirements
Start by naming what is different. One person may enjoy more chilli, a larger portion of grains or a sharper dressing. An allergy, intolerance or other dietary requirement needs a different level of planning. A shared pan is not automatically suitable for both people. Check labels and preparation needs first, and choose a meal that can be made safely with the space and equipment available.
Choose a shared base that both people enjoy
Look for a component you can prepare once: rice, roasted vegetables, a simple sauce or a bowl of washed leaves. Make sure that base suits both people before building the rest of dinner around it. Then decide what needs to remain separate. A grain bowl is often easier to adapt than a finished casserole in which every ingredient has already been mixed together.
Keep strong finishes at the table
Chilli flakes, lemon wedges, herbs, grated cheese and a dressing can let each person finish a portion to taste when those additions are suitable for the household. Add them deliberately rather than setting out every condiment you own. If one person prefers milder food, cook the shared component gently seasoned and let the other add more heat afterward. Taste and adjust each plate separately.
Divide late, but early enough
There is usually a useful point between cooking everything twice and mixing everything together. You might cook a batch of vegetables, divide it into two pans, then finish each portion with a different sauce. Work out that point before turning on the hob. Use clean utensils and separate equipment where needed; removing an ingredient from a finished dish does not make it suitable for someone with an allergy.
Write the extra work into the plan
Two finishes still take ingredients, pans and time. Choose one simple change, such as a different topping, before attempting two proteins and two sauces on a busy evening. Put both sets of quantities on the shopping list so the flexible dinner does not become a last-minute puzzle. If portions differ, decide that before serving rather than assuming both plates must look exactly alike.
Keep the combinations that feel easy
After dinner, note which adaptation worked without making the evening harder. A short list of dependable shared meals can reduce the nightly negotiation. Some evenings, two separate meals may be the more sensible choice; the aim is a workable routine for your household. Use flexibility where it helps, and keep the food enjoyable and suitable for the people who will actually eat it.