- Preheat the oven to 350°F (177°C). Grease and flour 3 Handstand Kitchen silicone molds of your choice (we like hearts!) Recipe yields approx. 18 cupcakes.
- Whisk the flour, baking soda, and salt together in a medium bowl. Set aside.
- Using a handheld mixer, stand mixer fitted with a whisk or paddle attachment, or a whisk, mix the oil, peanut butter, brown sugar, egg, sour cream, and vanilla extract together in a large bowl. Add the dry ingredients, milk, and peanuts and whisk or beat together until completely combined. Avoid overmixing. Batter will be slightly thick.
- Pour/spoon the batter into silicone molds, filling only 2/3 full to avoid baking over the sides. Bake for 21-23 minutes, or until a toothpick inserted in the center comes out clean and the tops of the cupcakes spring back when gently touched. Allow the cupcakes to cool completely before frosting.