Homemade Potato Gnocchi with Brown Butter Sage Sauce

Ingredients

• 2 pounds Yukon Gold potatoes, scrubbed
• 2 cups "00" flour, plus more for dusting
• 1 large egg, lightly whisked
• 1 teaspoon kosher salt, plus more for boiling the gnocchi
• 3 tablespoons extra-virgin olive oil
• 1 1/2 pounds boiled gnocchi
• Kosher salt and freshly ground black pepper, to taste
• ½ cup unsalted butter
• 30 sage leaves
• 3 garlic cloves, finely sliced
• Zest of 1 lemon
• 2 tablespoons lemon juice
• Grated parmesan, for serving