• Preheat your oven to 350°F.

Make the Cookie Base

• Combine the butter, granulated sugar, and brown sugar in a large mixing bowl.
• Use an electric hand mixer to cream the ingredients together until the sugar is completely dissolved.
• Whisk in the egg for about a minute, or until it is fully incorporated with the creamed sugar.
• Gently whisk in the baking powder, baking soda, and all-purpose flour. Make sure there are no pockets of dry flour in your cookie dough.
• Set the cookie dough aside.

Prepare the Frangipane

• Start by creaming together the sugar and butter in another bowl.
• Once the sugar mixture is creamed, whisk in the egg and almond extract.
• Gently whisk in the flour and slivered almonds, ensuring the ingredients are fully combined.

Assemble and Bake the Cookies

• Use your hands or a spatula to roughly work the two mixtures together until just combined.
• Use a 2-Tablespoon (#40) cookie scoop to drop balls of cookie dough onto a baking sheet.
• Bake your cookies for 12 minutes.
• Let them cool for a few minutes before transferring them onto a wire cooling rack. Dust with powdered sugar if liked.