Combine 1 cup peaches, mango juice, sugar and cornstarch in a medium saucepan. Cook and stir over medium heat until mixture bubbles and thickens. Cool for 10 minutes, then add the remaining 1 cup peaches. Set aside.
Preheat oven to 300° F.
Combine all cheesecake ingredients in a mixing bowl and beat on medium speed with electric mixer until smooth. Place paper baking cups into muffin tins and fill cups 2/3 full with cheesecake batter. Bake for 40 minutes.
Mix sour cream filling ingredients in a small mixing bowl using a spoon. When the cupcakes sink in the middle, place a scant Tbsp of sour cream mixture in the middle of each one. Place back into the oven for 5 more minutes. Remove from oven and cool.
When cool, spoon about 1 1/2 to 2 Tbsp of Peach Mango Topping over the top of the sour cream filling on each cupcake and refrigerate.Servings: 1 1/2 to 2 dozen cupcakes