I make 4 loaves of bread at the weekend, and freeze 3 for the week.
I also batch cook something every weekend and freeze so there's always a variety of dinners quickly available, so bolognaise, tomato and veg pasta sauce, chickpea curry, mixed bean chilli or beef chilli, aubergine and lamb bake, etc.
If we have leftover meat from a roast we slice and freeze with lemon or lime juice, garlic, ginger and chilli ready for a stir fry, or mince it to make a cottage or shepherds pie.
And I bake oat bars every few weeks, slice and freeze individually. They're good for breakfasts or a filling snack. I use oats, peanut/almond butter, some cooked, mashed fruit, usually apples or pears, and some nuts and/or seeds.
When I have plenty of time I make preserves such as chilli and garlic sauce, chilli jam, piccalilli, gooseberry jam, etc.
I love some of the ideas on this thread and may add them to my list.