Your slow cooker is your best friend. You can make near enough any meat or vegetable dish in it. I use to cook spag bowl, chilli, all chicken dishes, gammon, can even cook jacket pot in it.
It's also good to make 'dump bags' at the weekend when you buy your ingredients, makes week day cooking so much easier. So I would make a meal plan I.e chilli, sweet and sour chicken, sausage casserole, spag bowl, roast gammon, chicken biriyani. In each bag I would chop and place all vegetables/potatoes and chicken if chicken dish. In the morning grab the bag you want to cook for that day, if its a chicken dish it's generally all in the bag, I empty into slow cooker, pour over sauce, I use lots of different schwartz/colmans mixes (I cook all in slow cooker not just the ones that say slow cook on them) and I cook on high all day until 5/6pm meat just melts in the mouth. With the mince dishes I fry off the mince and chopped frozen onion in the morning, add all other ingredients into slow cooker, so all veg that's in the dump bag plus say tins of tomatoes and kidney beans in chilli sauce, can also add dried red lentils or tinned drained green lentils (no one will notice as it just blends into consistency of the meat), add packet sauce mix once mince browned add to slow cooker stir and leave to cook all day.
I would also do this for cottage pie, just move mince to oven dish in the evening, cook a bag of frozen mashed potato in microwave (can even get away with adding some frozen cauliflower and carrots to it. Add milk and knob of butter. Once cooked mash it all together in bowl add ontop of the mince you've been cooking all day and pop in oven for 20 mins.
Gammon joint I buy unsmoked, rinse in cold water, cut off the large white rind, place in slow cooker with an inch of cold water, cook on high, will be cooked for dinnertime, take out and I generally shred like you would pulled pork, we then have in wraps with some salad, or gammon, egg and chips, lots of people use as meat for a roast, leftovers for sandwiches, a small £4ish joint can easily do 2 meals for 4.
Other things we have regularly
Pasta bake and garlic bread
Breaded chicken wraps with salad, mayo and sweet chilli sauce.
Pasta, tuna, cucumber, tomatoes, sweetcorn, mayo.
Slow cooked sweet potato chilli
Pizza pasta bake
Wrap pizzas (use a wrap as the base with some tomato puree or bbq sauce, everyone adds filling of choice, we generally have mozzarella (pre grated from bag) pepperoni, peppers and mushrooms that I fry off before adding, takes minutes, bit more cheese, throw in oven for 8 mins, lovely thin crisp base and any toppings you like.
Chicken casserole in slow cooker
Braising steak stew in slow cooker
Mini meatballs in slow cooker, I get normal meatballs, split in half and re roll, brown in frying pan before adding to slow cooker with other ingredients, my kids just prefer them smaller, looks like more meatballs per person too.
Vegetarian kebab meat in pitta breads with salad and sweet chilli sauce or just mayo (firm favourite in our house)
All dishes once slow cooked can take just mins to pull together xx