Wet a piece of parchment paper and place it in an 8x8-inch or 9x9-inch baking dish (wetting it helps it to stick in the pan and not pop up, you can also do this with nonstick cooking spray). Set aside.
To a large pot over medium heat add 1 cup (2 sticks) unsalted butter, ½ cup light brown sugar (packed), 1 teaspoon vanilla extract, ¼ teaspoon ground cinnamon and ¼ teaspoon kosher salt. Mix until butter is melted.
Add 3 cups quick cooking oats and ½ cup unsweetened coconut flakes. Mix until combined. Set aside.
In a separate small pot add 1 cup mini semisweet chocolate chips and 1 cup creamy peanut butter. Over medium heat mix until melted and combined. Set aside.
Transfer ½ of the oat mixture to the baking dish. Firmly press the mixture into the baking dish.
Pour the chocolate mixture into the baking dish (on top of the oat layer).
Sprinkle the remainder of the oat mixture into the baking dish.
Sprinkle ¼ cup mini sweetened chocolate chips on top.
Gently press the chocolate chips and oatmeal mixture into the chocolate.
Cover and refrigerate for at least 3 hours.
Cut into 9 or 16 bars.
Notes
Please refer to my FAQ’s (Frequently Asked Questions) and ingredient list above for other substitutions or for the answers to the most common questions.