Mashed Potato Gnocchi

Ingredients (9)

• 2 cups mashed potatoes
• 1 large egg yolk
• 1 cup all-purpose flour, maybe a bit more
• Pinch of salt
• Sage Butter Sauce:
• 3 tablespoons unsalted butter
• 1 tablespoon fresh sage, minced
• 2 tablespoons cooking water from gnocchi
• 1/4 teaspoon red pepper flakes (opt.)