1 small can evaporated milk
1½ lbs. ground beef - browned
½ cup oatmeal or crushed crackers
1 egg
½ cup chopped onion
1 tbsp. prepared mustard
1½ tsp. salt
1/8 tsp. pepper
2 cups grated cheese

Combine together. Place open hamburger buns on a cookie sheet. Spread 2-3 tablespoons of mixture onto each bun. Bake 350 degrees 25-35 minutes. If desired, top with cheese slices during the last five minutes of baking time.