These Sugar Cookie Pinwheels aren't your typical flavorless pinwheels! For these pinwheels, I made a chocolate “shmear” filling (made with real bittersweet chocolate and cocoa) and rolled the sugar cookie dough around the shmear. Not to toot my own horn, but these are downright delicious.
Place the chopped bittersweet chocolate in the bowl of a food processor, and process until it is in tiny flakes. (A high-speed blender might also work.) Add the remaining ingredients and process until the filling comes together in a moist paste.
This can be made in advance and kept in the refrigerator. Bring to room temperature before spreading on the cookie dough.
To Make the Sugar Cookies:
In a small bowl, whisk together the flour, salt, and baking powder.
Combine the butter and sugar in the large bowl of a stand mixer, and beat with a paddle attachment until fluffy, 1-2 minutes. Add the egg and beat until it is well-combined, then add the vanilla and almond extracts, if using.
Add the flour and mix everything together on the lowest speed, until the flour almost disappears into the dough. Finish stirring in the flour by hand with a spatula, scraping the bottom and sides of the bowl well.
Divide the dough in half and form each half into a thin disc. Wrap the discs in plastic wrap and refrigerate until chilled, about 45 minutes.
Roll one half of the dough out between two sheets of floured parchment paper. Roll it into a thin rectangle about 12x8 inches, a little less than 1/4” thick. Spread half of the chocolate filling on top of the sugar cookie dough, taking care not to tear the dough as you spread the filling.
Use the sheet of parchment the dough is resting on to help roll the sugar cookie dough up into a tight cylinder. Repeat with the second half of dough and chocolate filling. Wrap the dough logs in plastic wrap and chill again until very firm, about 1 hour.
Preheat the oven to 350 degrees Fahrenheit. Cover two baking sheets with parchment paper, and pour the colored sugar sprinkles into a bowl.
Use a very sharp serrated knife to cut the log of dough into circles about 1/2-inch thick. Roll the edges of the cookies in the sugar sprinkles, and place them about 2 inches apart on the baking sheets. Bake for 12-14 minutes, until puffed, slightly golden, and set around the edges.
Let cool for 5 minutes on the baking sheet before removing them. Store in an airtight container at room temperature.