Step 3

Place the hot squash mixture in a blender. Add salt, pepper, and Greek yogurt. Remove the center piece of blender lid (to allow steam to escape); secure blender lid on blender. Place a clean towel over opening in blender lid (to avoid splatters). Blend until smooth. Place blended squash mixture in a bowl; stir in Gruyère, pecorino Romano, and 2 tablespoons Parmigiano-Reggiano. Stir until combined.