Preheat the oven to 375°F. Line a cookie sheet with parchment paper and set aside.
In a large bowl, beat 1/2 cup peanut butter spread with salted caramel, 1/2 cup light brown sugar (packed), and 1/4 cup granulated sugar until light and fluffy (use a hand or stand mixer or a whisk).
Add 1/2 teaspoon vanilla extract and 2 egg whites to the peanut butter-sugar mixture. Beat until well combined.
In a separate large bowl, stir together 1/2 cup + 2 tablespoons gluten-free oat flour, 1/2 teaspoon baking powder, 1/4 teaspoon salt, and 1/4 cup + 2 tablespoons cocoa powder until evenly mixed.
Stir the dry mixture into the peanut butter mixture until combined. Fold in 1/4 cup mini chocolate chips. The dough will be quite sticky.
With lightly moistened or clean hands or using a spatula, roll the dough into a ball and place it onto the prepared parchment-lined cookie sheet. Pat the dough into an even circle about 9 inches in diameter.
Bake on the center rack until the edges just feel set, about 15 minutes. Remove from the oven and let the cookie cool completely on the pan.
While the cookie cools, make the frosting: in a small bowl, mix 1/4 cup non-fat vanilla Greek yogurt, 3 tablespoons peanut butter spread with salted caramel, and 2 teaspoons honey until smooth and well combined.
Once the cookie is completely cooled, spread the frosting evenly over the top.
Sprinkle additional mini chocolate chips over the frosted cookie as desired.