Preheat oven to 350°F and grease pie pan with butter.
Sift the flour, white sugar, baking powder, and salt into a medium-sized mixing bowl.
Crack the egg into a clear measuring cup. Add milk so that it comes to the ¾ cup line. Mix egg and milk with a whisk.
Add liquids to the dry ingredients. Whisk just until smooth.
Pour into a greased pie pan. I used butter and liberally greased the pan.
Cut butter into thin squares and place over top of batter. Put them about one-inch from sides and one-inch apart all over. I used about 2 Tablespoons.
Cover the butter and batter with brown sugar. About ½ cup to ¾ cup.
Sprinkle cinnamon all over the brown sugar.
Bake in 350 degree oven for 20 minutes.