• Preheat oven to 375°F.

To Mix the Cake

• In a medium bowl, combine the flour, sugar, baking powder, & salt. egg, milk, & melted butter. Mix until consistent. NOTE: There may be some smaller lumps. 
• To the center of the dry ingredients, dump the eggs and milk. While mixing only the wet ingredients, pour your melted butter. This prevents the butter from clumping.
• Once butter is incorporated into the wet ingredients mix together so all the batter ingredients are cohesive.
• The batter will be thick. Spread it into a greased 9-inch square baking pan or 9 x 13-inch pan if doubling the recipe.

To Make the Cinnamon Streusel Topping

• In a small bowl, combine the streusel topping ingredients.
• Sprinkle topping over the top of the cake batter.
• Bake for 30 minutes (9-inch square pan) or 35 minutes (9 x 13-inch pan) or until a toothpick inserted near the center comes out clean.
• Serve warm and with a small pat of butter, if desired.