1. 1. Preheat the oven to 350°F (180°C) and line a muffin tin with cupcake liners.

2. 2. In a bowl, mix together 1 cup of creamy peanut butter, 1/2 cup of vegetable oil, and 1 cup of white sugar until well combined.

3. 3. Add in 2 eggs and continue mixing until smooth.

4. 4. Gradually add in 1 cup of all-purpose flour and mix until just combined.

5. 5. Pour the batter into the cupcake liners, filling each about two-thirds full.

6. 6. Bake in the preheated oven for 18-20 minutes, or until a toothpick inserted into the center comes out clean.

7. 7. Allow the cupcakes to cool completely before frosting.

8. 8. For the frosting, mix together 1/2 cup of creamy peanut butter, 1/4 cup of milk, and 1 cup of confectioners sugar until smooth and creamy.

9. 9. Frost the cooled cupcakes with the peanut butter frosting.

10. 10. Enjoy these delicious peanut butter cupcakes!