Preheat oven to 400 degrees. Grease 9 x 1 1/2 inch round cake pan. Stir together in a bowl: 1/2 c. sugar 2 tsp. baking powder 1/2 tsp. salt
Make a well in center of mixture. Beat slightly with a fork in another bowl. One egg. Stir in 1/2 cup milk, 1/4 cup melted shortening or oil (vegetable). Pour egg mixture all at once into "well". Stir just until flour is moistened. Do not overmix. Batter will be slightly lumpy. During last few stokes stir in 1 cup finely chopped pared apple. Spread batter in cake pan. Sprinkle with Streusel Topping. Bake 25 to 30 minutes.
1/4 c. sugar
2 tbsp. flour
2 tsp. cinnamon
2 tbsp. butter
Mix together with fork until crumbly.