I do a general meal plan
Shop at aldi for basics
Improvise ie. I love honey mustard chicken volauvents but I've started doing puff pastry in a muffin tin instead (saves about $7 switching from vol cases to pastry sheets)
Buy the cheapest option when possible
Buy meat in bulk packs
Use rice, pasta or potatoes to stretch a meal
Make a lot of lunch things from scratch like mini quiches, sausage rolls etc.
Dinners that get cooked regularly:
-Devilled sausages with mash and veg
-Pasta bake (pasta, mince, sauce, cheese) will do two nights
-Quiche (homemade including shortcrust base) with chips and salad
-Chicken fried rice packed with veg
-Homemade chicken parmas with baked veg or chips & salad
-chicken & basil pesto pasta
-meatloaf with mash & veg
Most of those will also have enough left for lunch or dinner the next day.