Bologna Omelet

4 eggs, well beaten
1/4 tsp. baking powder
2 tbsp. diced onion
2 tbsp. diced green peppers
2 tbsp. diced celery
1/2 slice bologna, cut into small pieces
1 slice American cheese, cut into small pieces

Mix all ingredients together in bowl. Fry over medium heat in preheated, greased frying pan, turning once.