Credits: Jessica Seinfeld for Deceptively Delicious
Preheat the oven to 350 degrees Farenheit. Coat a 12-cup muffin tin with cooking spray or line with paper baking cups.
For the filling, puree the raspberries, beet puree, sugar and margarine in a blender or food processor; set aside.
For the batter, beat the sugar in a large bowl with the milk, yellow squash puree, oil, egg whites, lemon juice and lemon extract until smooth. Add the flour, baking powder, and salt, then mix until incorporated.
Using about half the batter, fill each muffin cup about 1/3 full. Dot each with the raspberry filling, the cover with the rest of the batter.
Bake until the tops of the cupcakes are lightly browned and spring back to the touch, 20 to 25 minutes. Turn the cupcakes out onto a rack to cool.