01 -
Preheat the oven to 350°F. Line an 8x8-inch metal baking pan with parchment paper or coat with nonstick spray.
02 -
In a medium mixing bowl, whisk together flour, baking powder, ground cinnamon, salt, and rolled oats until evenly distributed.
03 -
In a large bowl, whisk melted butter and brown sugar until combined. Add the egg and vanilla extract, whisking until fully incorporated.
04 -
Gradually fold the dry mixture into the wet ingredients, mixing just until all components are evenly blended. Do not overmix.
05 -
Spread the batter evenly into the prepared pan. Bake for 28 minutes, or until the edges are golden brown and a toothpick inserted in the center comes out clean.
06 -
Allow bars to cool in the pan before slicing into portions and serving.