Mango Crumble Cake

I bought a case of mangos from Costco, and I like to enjoy eating them fresh, but after a few days, I decide to bake a cake using these mangos before they get too ripe. This is the recipe:

Cake Ingredients:

• 1/2 cup butter, room temperature
• 1 cup sugar
• 2 eggs
• 2 cups all-purpose flour
• 1 1/2 tsp. baking powder
• 1 tbsp. lemon peel
• 1/2 cup milk
• 2 - 3 mangoes, peeled, and cubed
  

Topping Ingredients:

• 1 1/4 cup all-purpose flour
• 3/4 cup sugar
• 3/4 cup butter, chilled

  Instructions:

• Preheat oven to 350° F. Grease a springform pan
• In medium bowl, beat butter and sugar. Add eggs and beat.
• Blend flour, baking powder, and lemon peel together.
• Add flour mixture alternately with milk into butter mixture and mix well.
• Spread batter in greased pan.
• Arrange mango cubes on top of batter

To make Topping:

• In a small bowl, combine flour and sugar.
• Using 2 knives or a pastry blender cut in butter until mixture resembles large crumbs.
• Sprinkle over mangoes.
• Bake for 40 - 45 minutes. Check with wooden toothpick to see if it is done (should come out clean - no batter on toothpick).
• Cool in pan on a wire rack.
• Makes about 16 servings. Tastes great served with whipped cream!