Line a 13- x 9-inch baking pan with parchment paper, leaving a bit of paper to hang over sides.
Combine first 5 ingredients in a medium bowl.
Combine remaining ingredients in a small saucepan. Heat over low-medium heat, stirring frequently, until mixture combines and melts together. Pour mixture over oat mixture; stir until well-combined.
Pour mixture into prepared pan and press with a spatula to evenly cover bottom of pan. Refrigerate for at least 3 hours. Remove from pan using overhang of paper and cut into bars. Store in fridge. (Bars are best served chilled)