Gnocchi With Brown Butter and Sage

INGREDIENTS

• 3 large russet potatoes (1 1/2 to 1 3/4 pounds)
• 1 tablespoon red pepper flakes
• 1 large egg
• Kosher salt
• 1/2 cup shaved and/or coarsely grated parmesan cheese
• 6 tablespoons salted butter
• 4 sage leaves, thinly sliced
• 1 to 1 1/2 cups all-purpose flour, plus more for dusting