Cut the chicken breast into even, fry-shaped thin strips.
Mix paprika, salt, garlic powder, MSG, black pepper, soy sauce, and vinegar in a bowl.
Add the chicken strips, toss to coat evenly, and let rest 15–20 minutes.
In the same bowl with marinated chicken, add the egg and flour, mix until slightly sticky.
In a separate tray, combine breadcrumbs, panko, and rosemary.
Press each chicken strip into the breadcrumb mixture, covering all sides.
Arrange coated strips on a tray while heating oil.
Heat oil in a deep pan over medium heat.
Fry chicken strips in batches for 3–4 minutes, turning occasionally until golden brown and crispy.
Transfer to a wire rack or paper towel to drain excess oil.
Mix mayonnaise and sweet chilli sauce in a small bowl. Adjust to taste.
Serve hot with sweet chilli mayo dip. Pair with fries, coleslaw, or salad.