My three go-to cooking ideas are Italian, Mexican and Indian (Curry).
I almost always have chicken, beans and rice leftover in the fridge.
For Italian I fool around with fresh tomatoes or canned/jarred. I usually throw in whatever veggies I have hanging around. I serve over noodles or rice. For Mexican I season it with cumin. garlic, onions, lime, cilantro. For Indian I use curry powder.
Here's what I do. I have a big cast iron skillet. I saute some onions, maybe some peppers and then throw in the cooked rice (or noodles for Italian) let that cook together for a few min then I layer over it the meat, beans, other veggies, tomato sauce for Italian or mexican, coconut milk mixed with a spoon fulll of peanut butter for the curry if i have it. I season the layers with the appropriate spices and salt. Then cheese over all if appropriate. Cover. It's ready when cheese has melted. One pan for clean up too!