Here's an easy one:
Brown meat, add a can of tomato sauce, a can of water, spices (oregano, onion soup mix, whatever floats your boat), and raw macaroni. Cover and cook over low heat, stirring occasionally. I think it's done within 15 minutes. Can add veggies to it too (I sometimes put in stewed tomatoes also).
Another:
Homemade pizza. Am I kidding? Nope!
Mix 1 packet dry yeast, 1 C. warm water, 2.5 cup flour, 2 TBSP. oil, 1 tsp. sugar, 1 tsp. salt. Let sit for 5 minutes. Roll out. Spread with pizza sauce. Put on shredded cheese. Add any veggies you so desire. Bake at 425 for 15 minutes. If done right, I can do the whole thing in a half hour

Chicken cutlets strips over the fire, not even in a stir fry are also easy and simple to cook. Sautee with onion, garlic, peppercorns, and paprika. Cover and let cook 15 minutes. In the meantime make rice or couscous and serve with that.
Another recipe I've tried calls for sauteeing it with onion, and then pouring grape juice on it and letting it soak in that while it cooks.
I never make a weekday supper that takes longer than what your guidelines are unless it's a quiche or something, and that's rare. Fleishigs is always on the stove or grill (steaks are easy

); milchigs usually involve pasta.
Tuna Noodle Casserole:
Cook pasta and veggies if want. While cooking, mix up some tuna and (ceram of) mushroom soup condensed can version...when pasta cooked, add to the tuna mixture, mix, pour into greased pan, and bake a half hour at 350. Can cover with crushed cornflakes or french onion rings if want...