Nutella Whoopie Pies

For the cookies:

Preheat oven to 350ºF.

Beat the sugar, butter, and eggs together until well combined in a stand mixer. Add the oil and vanilla and mix until blended.

In a separate bowl, combine all of the dry ingredients. Add half of the dry mixture and beat until blended. Add half of the milk and beat again. Add remaining dry mixture and beat. Add remaining milk and beat until blended.

Scoop batter onto a 2 baking sheets. Bake for 10 to 12 minutes. Let cool and transfer to a wire cooling rack.

For the frosting:

Add all frosting ingredients to a stand mixer with the whisk attachment. Whisk on high for 5 minutes until light and fluffy.

Spread filling onto cooled cookies.