INGREDIENTS
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Cooking spray
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8 ounces top sirloin steak, trimmed and very thinly sliced
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3/8 teaspoon kosher salt, divided
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1 tablespoon butter
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2 garlic cloves, minced
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1 (8-ounce) container presliced cremini mushrooms
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4 ounces part-skim mozzarella cheese, shredded and divided (about 1 cup)
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4 (8-inch) whole-wheat flour tortillas
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1 cup lower-sodium marinara sauce (such as Dell'Amore), warmed