Pour 1–2 inches of oil into a deep skillet and heat over medium until it reaches about 350°F (ready for frying).
Trim and cut the chicken breast into bite-sized pieces; set aside.
In a shallow dish, combine the all-purpose flour, garlic powder, and a pinch of salt and black pepper.
In a second shallow dish, whisk together the egg and milk; season lightly with salt and black pepper.
Coat each piece of chicken first in the flour mixture, then dip in the egg mixture, then return to the flour mixture so each piece is well coated.
Carefully place coated chicken pieces into the hot oil in a single layer and fry until golden brown, about 3–4 minutes per side.
Remove the chicken to paper towels to drain and sprinkle lightly with salt.
Transfer the drained chicken to a large bowl, add the sweet chili sauce, and toss to coat evenly.
Sprinkle with sesame seeds and garnish with julienned carrot and chopped cilantro; serve warm.