As others say meal planning is key.
One thing I do a lot of is make a meal go longer.
Lamb shanks are expensive right? But I slow cook them. ..eat them with veg one night. Then shred the meat and bulk up with veggies for sauce and make lamb ragu with pasta the next night or freeze it. Usually getting 2 or three meals in total.
I do this with roasting a large chicken too. Eat meat one night as a roast veggie dinner..chop up leftover meat to make pasta or a quick curry with rice the next.