Pressure-Cooker Potato-Cheddar Frittata

Directions

• In a large skillet, heat oil over medium-high heat. Add potatoes; cook and stir until lightly browned, 4-6 minutes. Transfer to a greased 1-1/2-qt. baking dish. Whisk next 7 ingredients; stir in shredded cheese. Pour egg mixture over potatoes. Loosely cover baking dish with foil.
• Place trivet insert and 1 cup water in a 6-qt. electric pressure cooker. Fold an 18x12-in. piece of foil lengthwise into thirds, making a sling. Use sling to lower dish onto trivet. Lock lid; close pressure-release valve. Adjust to pressure-cook on high 30 minutes.
• Let pressure release naturally for 10 minutes; quick-release any remaining pressure. Using foil sling, carefully remove baking dish. Let stand 10 minutes.