Preheat the oven to 350 degrees F. Line the bottom only of a 8- X 8-inch baking pan with parchment paper.

In a medium bowl, add all crust ingredients. Beat using an electic hand mixer on medium speed until mixture resembles coarse crumbs.

Pour mixture into prepared baking pan. Spread and press down evenly. Bake until edges are lightly browned, about 15 to 20 minutes.

While the crust is baking, make the filling. In a medium bowl, add all filling ingredients. Beat using an electric mixer on low speed until well combined and scraping down sides of the bowl as needed.

Pour the filling over the partially baked crust. Contine baking until filling is set, about 18 to 20 minutes. Sprinkle powdered sugar on top. Cool completely on a wire rack before cutting.

Cut into rectangle bars or squares and serve immediately. Store in a sealed container at room temperature.