Chili Pasta Bake

vegetable oil

small white onion, chopped

ground beef 

Salt and Pepper

small pasta shells {bow ties, elbow, or rotini would work as well}

{15 oz.} can tomato sauce

{1 oz.} can diced tomatoes and green chilies {we use mild}

{15 oz.} can black beans {kidney or pinto work too}

chili powder

cumin

cayenne powder

water

cheddar cheese, shredded

Sour cream {optional}

Green onions {optional}