01 - Combine chicken strips with olive oil, minced garlic, paprika, dried oregano, salt, and black pepper in a mixing bowl. Toss until chicken is thoroughly coated.
02 - Preheat a large nonstick skillet over medium-high heat. Add marinated chicken and cook for 5 to 6 minutes, turning occasionally, until chicken is fully cooked and lightly browned. Transfer to a plate and let rest.
03 - Arrange flour tortillas on a clean surface. Evenly divide chicken, shredded mozzarella, shredded cheddar, red onion, diced tomato, and baby spinach across the center of each tortilla.
04 - Fold the sides of each tortilla inward and roll tightly to form sealed wraps.
05 - Melt unsalted butter in a clean large skillet set over medium heat. Place wraps seam-side down in the skillet and grill for 2 to 3 minutes per side, turning once, until golden and the cheese has melted completely.
06 - Transfer grilled wraps to a cutting board, slice each in half if desired, and serve immediately while hot.