Preheat the oven to 350 degrees F. Brush the top of a muffin pan with vegetable oil and line it with 10 paper liners.
Into a medium bowl, sift together the flour, baking powder, baking soda, cinnamon, ginger, nutmeg and salt. In a larger bowl, whisk together the eggs, pumpkin, granulated sugar, brown sugar and the 1/2 cup vegetable oil. Add the flour mixture and stir to combine.
Scoop the batter into the prepared tins (I use a 2 1/4-inch ice cream scoop) and bake for 20 to 25 minutes, until a toothpick comes out clean. Cool completely, spread the cupcakes with the Maple Frosting and sprinkle with the chopped Heath bars.
In the bowl of an electric mixer fitted with the paddle attachment, cream the cream cheese, butter, maple syrup and vanilla on medium-low speed until very smooth. With the mixer on low, slowly add the confectioners' sugar and mix until smooth.