Peanut Butter Cup Cake

My youngest turned 3 this year and I had seen this super cute cake shaped in the number three that I knew I just had to do! It called for whatever cake mix that you wanted to use so I scrolled through my pins and found this peanut butter cup cake that I knew would be super tasty. I love chocolate and peanut butter together! The frosting is super yummy - light and fluffy! It was made as just a regular 9x13 cake, but I chose to form it in the shape of a 3 for my son's birthday... Choose however you want to make it!

Peanut Butter Cup Cake
(recipe found on pinterest via thecountrycook.net)

1 box chocolate cake mix (I used dark chocolate)
1/2 cup butter
3/4 cup creamy peanut butter
2 cups powdered sugar
2 tablespoons milk
1 teaspoon vanilla
m&m's - if making the 3 cake

Prepare cake as directed. If making the 3 cake, you will need to double this recipe and make it in two bundt cake pans. If you just want it to be a regular cake you can make it as the recipe states. Let cool completely. To shape the number 3, cut one bundt cake (using a clock as a reference) cutting horizontally at 9 and vertically at 7 for the top of the 3. Next cut the second bundt cake horizontally at 9 and vertically at 11, for the bottom of the 3. You may need to trim a bit here and there to make the 3 "fit" better. To make the frosting beat together butter and peanut butter until well combined. Add powdered sugar and mix until incorporated. Add milk and vanilla and mix again until combined. Carefully frost your cake... This frosting will pull away from the cake very easily so frost gently! Add m&m's to cake if desired!