1 lg. can refried beans
1 lg. pkg. grated Cheddar cheese
1 pkg. flour tortilla shells
1 lg. onion
1/2 cube butter

Chop onion. In pan, mix beans, butter, onion, and 3/4 of cheese. Heat until well mixed. Fill shells with mixture and put into cake pan. After shells have been filled, sprinkle remaining cheese on top. Heat before eating.