Sweet Potato Gnocchi with Sage-Butter Sauce

Ingredients (10)

• + 1 large russet potato add to pantry
• + 1 large orange-fleshed sweet potato add to pantry
• + 1 egg add to pantry
• ✓ 2 ½ cups all-purpose flour
• + ⅓ cup rice flour, or as needed add to pantry
• ✓ 2 tablespoons olive oil
• ✓ 1 tablespoon butter
• + 6 leaves fresh sage, or more to taste add to pantry
• + 1 small garlic clove, crushed without breaking into pieces add to pantry
• + 3 tablespoons grated Parmesan cheese add to pantry