Preheat the oven to 350 °F (175°C). Fill cupcake pan with liners.
Cream the butter and sweetener together in a large bowl using an electric hand mixer. Add the eggs one at a time and continue beating. Mix in the coconut milk, sour cream, and vanilla extract.
½ cup butter, ¾ cup Keto sugar substitute, 3 eggs, ½ cup coconut milk, ½ cup sour cream, 1 teaspoon vanilla extract
Stir the dry ingredients in a separate mixing bowl, then slowly combine them into the egg liquid. Continue mixing until smooth.
¾ cup coconut flour, 2 teaspoons baking powder, White chocolate bar
Divide evenly by pouring the batter into each cupcake well. Each cupcake is a generous ¼ cup of batter. Bake for 16-18 minutes until a cake tester (toothpick or knife) comes out clean. Let the cupcakes cool in the pan before removing them.
Make the frosting while the cupcakes cool. Beat butter in a medium mixing bowl until creamy. Add powdered sweetener ½ cup at a time. Continue mixing until smooth. Add cream and mix well to combine. If the frosting looks too stiff, add additional cream, 1 tablespoon at a time, until you see the desired texture. Finally, split the vanilla bean lengthwise, scrape out the seeds, and mix them into the frosting.
½ cup butter, 2 cups powdered Monkfruit Sweetener, 6 tablespoons heavy cream, 1 vanilla bean or 1 tsp vanilla extract
Arrange on a wire rack or cake stand and frost or pipe with an icing bag.