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- Heat oven to 350°F. Line two large baking sheets with parchment paper. Remove chilled dough from refrigerator. Using a 2-inch round cookie cutter, cut cookies out of dough. Use a smaller cookie cutter to cut out centers from half of cookies. Transfer to prepared baking sheets, spacing cookies about 1 inch apart. Sprinkle tops of cut-out (not whole) cookies with sparkling sugar, if desired.
- Bake cookies 7 to 10 minutes or until edges are set. Let cool completely on baking sheets. Repeat process with remaining cookie dough (keep dough chilled while baking first batch).
- Once cookies are fully cooled, spread about 1 teaspoon Nutella on bottom side of whole cookies; top with cut-out cookies to form cookie sandwiches.
- Store cookies in an airtight container at room temperature for up to 3 days.
