1Heat oven to 350°F. Grease bottom and sides of 8-inch square pan with shortening or spray with cooking spray. In small bowl, mix all streusel ingredients with pastry blender or fork until crumbly; set aside.
2In large bowl, combine 1 cup flour, granulated sugar, baking powder, salt and 1 teaspoon cinnamon; mix well. Cut in 1/4 cup butter using pastry blender or fork until mixture is crumbly. Stir in milk, almond extract and egg until dry ingredients are moistened.
3Spread half of the batter (about 3/4 cup) in pan, forming thin layer. Top with half of the mango; sprinkle with half of streusel. Drizzle remaining batter evenly over streusel. Carefully spread batter to completely cover streusel. Sprinkle with remaining mango and streusel.
4Bake 40 to 45 minutes or until center is set when jiggled and toothpick inserted in moist spot near center comes out clean. Cool 15 minutes. Serve warm or cool.