Add 1/3 cup natural peanut butter, 1/3 cup oat flour, 1/2 cup protein powder, 2 tablespoons maple syrup, 2 tablespoons ground flaxseed, 3 tablespoons Greek yogurt, 1 tablespoon melted coconut oil, 1 teaspoon vanilla extract, and 1/4 teaspoon sea salt to a food processor or mixing bowl. Mix until a thick, uniform dough forms.Check the texture by rolling a small amount of dough into a ball. It should hold together without sticking to your fingers. Add a spoonful of yogurt if dry, or a light sprinkle of oat flour if sticky. Line a small loaf pan or square pan with parchment paper. Press the dough firmly and evenly into the pan. Sprinkle chopped peanuts and mini chocolate chips on top and gently press them in. Freeze for about 15 minutes, until firm enough to slice.
Add 1/4 cup chocolate chips and 1 teaspoon coconut oil to a microwave-safe bowl. Microwave in short intervals, stirring between, until smooth. The added oil keeps the chocolate soft so it doesn’t crack when sliced.
Slice the chilled bars and drizzle the melted chocolate over the top. Return to the fridge or freezer until set, then enjoy.