Step 1

Melt butter in a large sauce pan over low heat. Stir in brown sugar, vanilla, and oats. Cook for 3 to 4 minutes. Press half of mixture in to the bottom of a buttered 8 x 8 dish.

Step 2

In a microwave safe bowl, microwave the chocolate and peanut butter, stirring every 30 seconds until melted and blended. Pour the chocolate peanut butter mixture over the crust.

Step 3

Sprinkle the remaining oat mixture over the chocolate and peanut butter, pressing gently to form a crust.

Step 4

Refrigerate for 3 hours before cutting and serving.