• Preheat oven to 350 degrees.
• Whisk the first 3 ingredients in a bowl.
• In a separate bowl, whisk the peanut butter, egg and sugar until combined, then whisk in the milk until incorporated.
• Whisk the wet ingredients into the dry ingredients until just combined (you don't want to over beat the mixture).
• Grease or line mini muffin tins and fill 2/3 of the way up with the batter.
• Bake for 20 minutes or until a toothpick comes out clean.
• Cool cupcakes completely. Spread the top of each cupcake with frosting (instructions below) and serve.

Jelly Frosting:

• Place all ingredients in a bowl and whisk until throughly combined (you want the mixture to be smooth like frosting).
• Spread on cupcakes and serve.