There’s nothing more patriotic than using America’s favorite cookies for a Fourth of July treat. The chocolate sandwich cookies are repurposed into buttery star-shaped shortbread then glazed with white chocolate. The final touch: red, white, and blue sprinkles.
Line a 13-by-9-inch sheet pan with parchment paper.
Combine the butter and sugar in the bowl of a stand mixer fitted with the paddle attachment. Cream at low speed until light and fluffy, 3 to 4 minutes. Stop and scrape down the sides of the bowl. Add the vanilla and mix until incorporated.
Add the 2 1/4 cups flour. Mix at low speed just until it’s incorporated. Stop and scrape down the sides of the bowl. Add the cookie pieces and mix at low until they are evenly distributed throughout the dough.
Press the dough into the prepared 13-by-9-inch sheet pan. Get it as smooth as possible and refrigerate for 30 minutes.
Line 2 half sheet pans (18-by-13-inch each) with parchment paper.
Using a 3-inch star-shape cookie cutter, cut out stars from the chilled dough, dipping the cookie cutter in the 3 tablespoons flour in between cuts. Place the stars on each prepared half sheet pan then refrigerate.
Meanwhile, position racks in the upper and lower thirds of the oven and preheat to 325 degrees F.
Gently gather the dough scraps and press them back into the 13-by-9 inch sheet pan—however, only press into half of the pan. Then, refrigerate for 30 minutes or wrap with plastic and save for another time, for up to 5 days. Repeat the cutting with the cookie cutter and transfer the stars to the prepared sheet pans.
Bake the cookies until they are lightly golden around the edges, rotating the sheet pans halfway through baking, 27 to 29 minutes.
Allow the cookies to cool completely on the sheet pan.
Combine the white chocolate chips with the vegetable oil in a small microwave-safe bowl. Microwave for 10 seconds at a time until the chips are melted, stirring after each interval. Transfer to a piping bag. Cut a small hole at the tip then pipe the white chocolate onto each cooled cookie.
Before the white chocolate sets, decorate each cookie with the patriotic sprinkles. Allow the white chocolate to set completely before serving.