Heat large skillet over medium-high heat and add olive oil until shimmering. Toss chicken strips with salt and pepper. Place seasoned chicken in hot pan in a single layer without overcrowding. Cook undisturbed for 3 minutes to develop golden crust, then flip and cook another 2-3 minutes until just cooked through. Transfer to plate and tent with foil to keep warm.

In same pan, add sliced onions and cook for 2 minutes until softened and translucent. Add minced garlic and saute for 30 seconds until fragrant. Sprinkle in Mediterranean herb blend, smoky paprika, and chili flakes, stirring to coat and toast spices. Add bell peppers and cook for 3 minutes, stirring occasionally until softened but crisp. Return chicken to pan and toss everything together for 1 minute. Gently fold in fresh spinach, stirring just until wilted (about 45 seconds). Remove from heat.

In medium bowl, combine mozzarella and cheddar cheeses. Take 2/3 of mixture and blend with cream cheese and sour cream until well incorporated. Fold in fresh chives. Reserve remaining dry cheese for sprinkling inside wraps.

Whisk together melted butter and roasted garlic powder in small bowl. Lay tortillas flat on work surface and brush one side of each with aromatic mixture. Flip tortillas so buttered side faces down (this becomes the crispy exterior).

Working with one tortilla at a time, spread about 2 tablespoons creamy cheese mixture in center, leaving 2-inch border around edges. Top with 1/6 of chicken-vegetable mixture, distributing evenly. Sprinkle generous tablespoon of reserved dry cheese over filling. Fold bottom edge up over filling, fold in both sides, and continue rolling upward to create secure package. Press gently to seal, then set aside seam-side down.

Heat clean, dry skillet over medium heat. Place assembled wraps seam-side down in pan, working in batches to avoid crowding. Cook for 2-3 minutes until bottom develops golden-brown crust, then carefully flip. Cook for another 2 minutes on second side until crispy and cheese inside has melted. For even more melty interior, cover pan with lid during last minute of cooking.

Slice diagonally and serve immediately.