First, preheat your oven to 350 degrees Fahrenheit. Line an 8 inch square metal pan with parchment paper.

Make the frangipane. In a mixing bowl, combine the melted butter, egg, almond extract, almond flour, and sugar. Stir until a pasty mixture forms.

Then, make the blondie batter. In a clean mixing bowl, add the melted butter and brown sugar. Stir to combine.

Then, add in the eggs and almond extract. Stir together.

Add in the gluten free flour and baking soda. Stir to combine.

Spread half of this mixture into the prepared pan.

Carefully spread the frangipane on top. Spread out into an even layer.

Then, add the remaining blondie batter on top.

Sprinkle the slivered almonds on top.

Bake for 27 to 30 minutes, or until a toothpick inserted comes out with only moist crumbs.

Once the blondies have fully cooled, garnish with powdered sugar and carefully slice.