You can do weekly meal prep (cutting vegetables and setting asides premeasured ingredients), freeze stuff, then make that over the week. Cooking is still cheaper and all around healthier than eating out 24/7
I like to use my slow cooker a couple times a week. You could meal prep meals for your slow cooker when you have time, freeze them, and then throw stuff in the pot in the morning.
They're great but not ideal if you're working full time since you should ideally do some prep and make sure you stick everything in 7-8 hours before eating or 3-4 if you have a high setting A pressure cooker is probably better since you can whack everything together with minimal prep after work