01 -
Set the oven to 350°F (175°C) and ready your muffin pan with liners.
02 -
Combine the flour, cocoa, baking soda, and salt in a bowl.
03 -
In a different container, mix together the sugar, oil, eggs, and vanilla before incorporating dry ingredients, switching with milk additions.
04 -
Divide the batter into liners, filling each to about 2/3 capacity, and bake for 18-20 minutes; let them cool fully.
05 -
Prepare the filling by blending the peanut butter, powdered sugar, and milk together and fill the center of each cupcake.
06 -
Whip the butter and peanut butter until smooth; add powdered sugar, milk, and vanilla to complete the frosting. Pipe this mixture atop the cupcakes.