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Spray a 6- or 6-inch round pan (whatever fits best in your Instant Pot) with cooking spray.
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In a small bowl, whisk together the eggs, milk, salt and pepper.s Add the feta cheese and stir to combine.
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Put the spinach in the prepared pan, then pour the egg mixture over the spinach. Cover tightly with aluminum foil.
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Place a trivet in the bottom of the Instant Pot, then pour in 1 1/2 cups water. Place the pan on the trivet.
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Lock the lid in place. Select Pressure Cook and adjust the pressure to High and the time to 15 minutes.
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After cooking, let the pressure release naturally for 5 minutes, then quick release any remaining pressure.
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Once the float valve drops, open the lid and carefully remove the pan from the Instant Pot. Slice the frittata into 4 pieces and serve warm.