Pat chicken pieces dry with paper towels and season generously with salt and pepper. Let rest for 5 minutes.
Heat a large skillet over medium-high heat. Add 1 tablespoon butter and melt completely.
Add chicken pieces in a single layer, working in batches if necessary. Cook undisturbed for 2-3 minutes until golden, then flip and cook 2 minutes more. Remove to a plate.
Reduce heat to medium. Add remaining 3 tablespoons butter to the pan and allow to melt and foam.
Add minced garlic and cook for 30-45 seconds until fragrant but not browned.
Stir in Italian seasoning, paprika, and red pepper flakes, cooking for 30 seconds to bloom the spices.
Return chicken and any accumulated juices to the pan, tossing to coat in the garlic butter sauce. Cook 1-2 minutes more until chicken reaches 165°F internal temperature.
Remove from heat, add fresh parsley and lemon juice, and toss to combine. Serve immediately.