Heat a large skillet over medium-high heat. Spray with oil, add spinach and cook, tossing often, until just wilted, about 1 minute. Add eggs, salt and pepper and cook, tossing gently, until fluffy and cooked through, 3 to 4 minutes. Remove from heat, add mozzarella and toss again. Spoon egg mixture onto pitas, fold in half and serve right away or wrap in foil to eat on the go.
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