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 into the bottom of a buttered 8 x 8 dish. 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, reserving a couple of spoonful’s to drizzle over the top. Sprinkle the remaining oat mixture over the chocolate and peanut butter, pressing gently to form a crust. Drizzle the remaining chocolate and peanut butter over the top of the bars. Refrigerate for 3 hours before cutting and serving.
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