We have some simple easy stuff to fix in the freezer or the cupboard for those days when we are too tired to cook.
Last night we had "shake and bake" roast vegetables. It did take a little prep work, but mostly sliced carrots, mushrooms, zucchini and baked potatoes. I take the first three, slice them, throw them in a plastic bag with olive oil and then lay the slices out on cookies sheets in a 450 degree oven for a while until they slightly brown. The baked potatoes are on the side. It was surprisingly good and not much work.
When I'm lazier, we make some basmati rice and nuke some Indian food from Trader Joe's. I'm assuming you don't have Trader Joes, but there's got to be some relatively inexpensive frozen food you can prep, jar of pasta sauce, spaghetti and cheese? Or maybe it's all too much and with restaurant, there's no dishes to wash. If we had the money, we'd eat out more, too.