Easy Apple Cake
["1 tsp. baking powder", "1 c. milk", "1/2 tsp. soda", "1 egg, well beaten", "2 Tbsp. butter", "1 c. sugar", "1/2 tsp. salt (if desired)", "1 1/2 c. flour", "4 to 5 sliced apples", "extra sugar", "cinnamon"]
["Set oven at 350\u00b0.", "Grease 9 x 13-inch pan lightly."]
["baking powder", "milk", "soda", "egg", "butter", "sugar", "salt", "flour", "apples", "extra sugar", "cinnamon"]