1 1/2 c. Bisquick
1 c. milk
1 (10 oz.) pkg. sharp Cheddar cheese (shredded) or cheese of your choice
1 c. (or more) onion sauteed in 4-5 tbsp. butter

Mix all ingredients together, put only 1/2 the cheese in the mixture. Spread in a 9 x 13 inch greased pan. Sprinkle remainder of cheese on top. Bake for 20 minutes or so in a 450 degree oven until brown. If you like it more brown and bubbly looking, you can turn the broiler on for a few seconds.

This recipe can be doubled and put in a jelly roll pan to bake for a larger quantity of squares. This can also be prepared ahead of time and put in the oven when guests arrive and that way you have a warm appetizer.