Step 1

Place the oven rack in middle position and preheat oven to 450°F. Line 1 large baking sheet with parchment paper.

Step 2

In the bowl of a stand mixer fitted with the paddle attachment, add flour, cornmeal, baking powder, baking soda, and salt. Add the butter and toss with a fork to coat with the flour mixture. Mix on medium-low speed until the texture resembles coarse cornmeal, with the butter pieces no larger than small peas. Stir in cheeses, scallions and garlic. Hand stir the buttermilk into the mixture until just combined.

Step 3

Drop dough in 12 equal mounds about 2 inches apart on baking sheet. Bake until golden brown, 13-15 minutes. Transfer to a wire rack and cool about 10 minutes before serving.