1-First Step: Preheat your oven to 350°F and line an 8×8 inch baking pan with parchment paper for easy removal later. This ensures your blondies bake evenly and don’t stick.

2-Second Step: Make the frangipane filling by creaming 4 tablespoons butter and 1/4 cup granulated sugar until smooth in a bowl. Add 1 egg yolk, 1/4 teaspoon vanilla extract, 1/4 teaspoon almond extract, and 1/4 teaspoon orange zest if using, then fold in 2/3 cup almond flour and a pinch of salt to form a paste. Set it aside for now to let the flavors meld.

3-Third Step: Prepare the blondie base by mixing 1/2 cup softened unsalted butter and 1 cup packed light brown sugar in a large bowl until well combined. Add 1 large egg at room temperature, 2 teaspoons vanilla extract, and 1/4 teaspoon almond extract, stirring until the mixture is smooth and creamy.

4-Fourth Step: Stir in 1 1/3 cups all-purpose flour, 1/4 teaspoon baking powder, 1/4 teaspoon salt, and 1/3 cup almond flour into the wet mixture until just combined, taking care not to overmix to keep the texture chewy.

5-Fifth Step: Spread the blondie batter evenly in your prepared pan. Dollop the frangipane over the top and swirl it with an offset spatula or wooden skewer for a marbled effect that captures the essence of croissant blondies.

6-Sixth Step: Sprinkle 1/2 cup sliced almonds over the swirled batter for added crunch, then place the pan in the preheated oven.

7-Seventh Step: Bake for about 30 minutes, or until the edges are set and the center is slightly firm. Keep an eye on it to avoid overbaking, as this ensures your easy bakery style blondies remain moist.

8-Final Step: Allow the blondies to cool completely in the pan before dusting with powdered sugar and slicing into 16 squares. Serve them warm for a gooey center or chilled for a fudgy bite, making them ideal for sharing with family and friends.