I start by preheating my oven to 425°F so it's fully hot before the chicken goes in. While that heats up, I place my chicken breasts on a cutting board, cover them with plastic wrap, and gently flatten the thicker ends with a rolling pin. This one step makes a big difference in how evenly everything cooks.
Next, I arrange the chicken in a 9x13-inch baking dish, making sure the pieces aren't crowded together. I brush them lightly with oil, then sprinkle on the salt and pepper. I pop the dish into the oven uncovered and let the chicken bake by itself for about 10 minutes before it ever meets the sauce.
While the chicken is in the oven, I whisk the honey, broth, soy sauce, garlic, vinegar, salt, corn starch, and red pepper flakes together in a bowl. I make sure the corn starch is fully dissolved with no lumps, since that's what gives the sauce its glossy, thickened texture once it bakes.
Once the chicken has had its head start, I pull the dish out and pour the sauce evenly over the top. Adding it partway through, rather than at the very beginning, keeps the sugar from scorching around the edges of the pan. I slide it back into the oven for another 10-12 minutes.
I always check the internal temperature with a meat thermometer inserted into the thickest part of the chicken. Once it reads 165°F, I know it's fully and safely cooked. I never rely on cutting into the chicken to check, since that just lets the juices escape too early.
Finally, I cover the dish and let the chicken rest for about 10 minutes before slicing or serving. This resting time lets the juices redistribute through the meat instead of spilling out onto the cutting board, which keeps every bite tender.