01 -
Lightly spray a 7-inch cake pan with nonstick cooking spray.
02 -
Whisk eggs, half-and-half, oregano, 1/8 teaspoon red pepper flakes, and 1/2 teaspoon salt in a medium bowl until combined. Stir in provolone and Parmesan cheese. Pour the mixture into the prepared cake pan and gently lay the pepperoni on top.
03 -
Add 1 1/2 cups water to a 6- or 8-quart Instant Pot®. Place the pan on the rack and follow the manufacturer's instructions to lock the lid. Set to pressure cook on high for 11 minutes.
04 -
In a large bowl, toss spinach, artichoke hearts, parsley (if using), olive oil, red wine vinegar, remaining red pepper flakes, and a pinch of salt until evenly dressed. Taste and adjust seasoning if needed.
05 -
Once the cook cycle is complete, perform a quick release according to the manufacturer's instructions. Carefully unlock and remove the lid, allowing any remaining steam to escape.
06 -
Remove the pan from the Instant Pot® and cool slightly on a cutting board for about 2 minutes. Invert the frittata onto the board, then flip to have the pepperoni side facing up. Cut into quarters and serve with the spinach salad and extra Parmesan.