In a mixing bowl, whisk the all-purpose flour together with the corn starch, baking powder, baking soda, and sea salt. Set aside.
6.88 oz all-purpose flour, 0.28 oz Cornstarch, 1/4 tsp baking powder, 1/4 tsp sea salt, 1/4 tsp baking soda
In a separate mixing bowl, cream the softened butter together with the granulated sugar until light and fluffy, about 3 minutes.
2.47 oz butter, 7.05 oz granulated sugar
Add in the eggs one at a time. Beat for an additional minute.
3 eggs
Continue by adding half of the flour mixture, continuing on low speed, mixing until just combined.
Then add the sour cream, vegetable oil, vanilla bean paste and peppermint extract and mix until just combined.
5.29 oz sour cream, 1 oz vegetable oil, 1 1/2 tsp vanilla bean paste, 1/2 tsp peppermint extract
Finally add the other half of the flour mixture and mix until just combined. NOTE: Using a rubber spatula, give the batter a gentle fold to make sure all of the ingredients have combined.
Pour the preparation into each well of your Mini Muffin Tray to 3/4 full in order to have a nice top.