Soak the wooden skewers in water for at least 30 minutes.: The skewer soaking step helps prevent burning during cooking, and the sound of water slipping off them as you thread the pieces is oddly satisfying. Wet skewers also offer slight steam that can keep the inner edges of the chicken moist. A common oversight is not soaking long enough which can lead to charred tips, so allow a full 30 minutes at minimum.
Preheat the oven to 400 degrees Fahrenheit.: You want the oven hot enough to encourage surface browning while keeping the interior juicy, which results in that subtle crackle when you bite into the exterior. The steady heat creates a dry environment that encourages caramelization of the sauce later. Mistakes here include using a too low temperature which yields pale, unappealing skewers.
In a large bowl, combine the cubed chicken breasts, oil, garlic powder, salt, and pepper. Stir until all the chicken is coated evenly.: Tossing at this stage ensures every piece of chicken picks up seasoning, and you should see a thin, glossy sheen from the oil. You might hear a little slap as the cubes move together, and smell the faint warmth of the garlic powder . If pieces are crowded they will steam instead of roast, so use a roomy bowl and spread them when skewering to avoid that trap.
Put the chicken cubes onto the skewers.: Thread the chicken so the cubes sit snug but not cramped, leaving a small gap between pieces to allow heat circulation. As you work you can feel the weight balance on the skewer, and visually aim for even spacing. A misstep is loading too many pieces on one skewer, which prevents even cooking and can produce underdone centers.
Line a baking sheet with parchment paper and place the chicken skewers on the baking sheet.: Lining with parchment keeps cleanup easy and lets the undersides brown without sticking. Place skewers in a single layer to ensure uniform oven exposure, and you will notice the surface of the cubes beginning to dry slightly before color appears. Overcrowding the pan will trap steam, so give each skewer breathing room.
Cook the chicken for 20-25 minutes or until the internal temperature of chicken is 165 degrees Fahrenheit.: During roasting you will see the edges take on a light golden hue and may hear a faint sizzle as juices bubble. Using a meat thermometer is the best way to confirm doneness, inserted into the largest piece. The major mistake is relying solely on time, because oven variances can mean you need a few extra minutes for perfectly safe, juicy chicken .
While the chicken is cooking, in a small bowl, add the mayonnaise, sweet chili sauce, and Sriracha. Mix well.: Mixing the sauce now lets aromas bloom, and you will notice the sweetness from the chili sauce balancing against the tangy creaminess of the mayonnaise while the Sriracha adds a bright chili perfume. Stirring produces a glossy, velvety texture that clings well when applied. A common slip is under-mixing which yields uneven sauce distribution later.
Once chicken is cooked, remove from the oven and drizzle or brush the chicken with the bang bang sauce. Serve immediately.: As the components come together you should see a homogeneous, slightly viscous sauce. The motion of stirring releases a pleasing sheen and a blended aroma. If the sauce appears too thin, let it rest briefly to thicken; if too thick, a tiny splash of water can smooth it, but go slowly. Over thinning will reduce cling and flavor intensity.
Once chicken is cooked, remove from the oven and drizzle or brush the chicken with the bang bang sauce: The warm skewers will accept the sauce readily, and as you brush you can watch it gloss the surface and cling into the little nooks between cubes. The scent becomes richer and more layered, with sweet and spicy notes harmonizing. Do not overcrowd with sauce, or the exterior can become soggy rather than luxuriously sticky.
Serve immediately: Serving while still warm preserves that contrast between succulent interior and saucy exterior, and guests will appreciate the immediate pop of flavor. You should hear a pleasing stick when someone bites into a sauced skewer, and the texture will be at its peak. Waiting too long will let the sauce congeal and cool, which lessens the overall experience.