Preheat the oven to 325 degrees. Place paper liners in a 12-cup muffin tin. Prepare the cupcakes: Combine the flours, baking powder, potato starch, cinnamon, nutmeg and salt in a bowl with a whisk.
In a separate bowl, cream the butter and sugars with a mixer on low speed until combined, 6 to 8 minutes. Gradually mix in the vanilla and egg whites. Scrape down the sides of the bowl; continue mixing until light and fluffy. Add the flour mixture in 3 batches, alternating with the maple syrup and half-and-half, mixing after each addition and ending with flour. Mix until the ingredients are just combined; do not overmix.
Pour the batter into the prepared muffin tin, filling each cup about three-quarters of the way. Bake until a toothpick inserted in the center comes out clean, about 30-35 minutes. Cool completely before frosting.
Whipped Cream Frosting Ingredients
4 oz cream cheese, at room temperature
2 cups heavy whipping cream
1/3 cup granulated sugar
1 tsp vanilla extract
1 cup powdered sugar
Using a stand mixer, whip the cream cheese for 5 minutes until smooth.
Slowly add the heavy cream and beat on medium until it starts to thicken.
Add the granulated sugar and vanilla and continue to beat until stiff peaks form.
Lower the speed to low as you slowly add the powered sugar (it makes a bit of a mess so help incorporate it with a spatula if needed).