Ham and Cheese Puffs

1 cup cooked ham, finely chopped
1 tsp. mustard
1 tsp. horseradish
1/4 to 1/2 cup mayonnaise
1 tsp. grated onion
1 tsp. baking powder
3/4 cup grated cheese
1 egg, beaten
1 tsp. grated onion
1 tsp. baking powder

1. Combine ham, mustard, horseradish, mayo, onion and baking powder in  one bowl.
2. In another bowl, combine cheese, egg, onion and baking powder.
3. Place ham mixture on bread rounds.
4. Top with cheese mixture.
5. Broil til cheese is melted.