01 - Combine chicken strips, olive oil, minced garlic, paprika, dried oregano, salt, and ground black pepper in a mixing bowl. Toss thoroughly to ensure the chicken is evenly coated.
02 - Heat a nonstick skillet over medium-high heat. Add the marinated chicken and cook for 5 to 6 minutes, stirring occasionally, until the chicken is fully cooked through and lightly golden. Remove from heat and allow to rest.
03 - Arrange the flour tortillas on a clean work surface. Distribute the cooked chicken, mozzarella cheese, cheddar cheese, sliced red onion, diced tomato, and baby spinach evenly along the center of each tortilla.
04 - Fold in the sides of each tortilla and roll up tightly to enclose the filling and form wraps.
05 - Melt unsalted butter in a large skillet set over medium heat. Place the wraps seam-side down and grill for 2 to 3 minutes per side, turning once, until golden brown and cheese is fully melted.
06 - Transfer the wraps to a cutting board, slice in halves if desired, and serve immediately while hot.