Step 1

Preheat oven to 350 degrees F.

Step 2

In a large bowl, cream together butter, sugar and brown sugar together.

Step 3

Add vanilla, eggs, and 1 cup of the peanut butter; stir to combine.

Step 4

Add oats, flour, baking soda and salt and mix until well combined.

Step 5

Spray a baking sheet (half sheet jelly roll pan that is approximately 17.8 x 12.8 x 1 inch) with nonstick cooking spray and spread out dough in an even layer.

Step 6

Bake for 15 minutes and remove from oven.

Step 7

Drop remaining peanut butter (about 1 1/2 cups) by very small spoonfuls (we use a baby spoon) all over on top of warm bars. Let set for about 5-6 minutes and gently spread when peanut butter has begun to melt. It will spread easily when the peanut butter has softened on the warm bars. Don't try to spread it while still thick.

Step 8

Then let the bars cool until peanut butter has set up.

Step 9

While cooling, mix together frosting ingredients with a hand mixer until smooth and spread on top of bars.

Step 10

Cut into bars and serve.