Creating Brown Sugar Pineapple Chicken is a simple process if you follow these easy steps:

1. Prepare the Chicken: Start by trimming any excess fat from the chicken breasts. Pat them dry with paper towels.
2. Make the Marinade: In a bowl, combine brown sugar, soy sauce, olive oil, minced garlic, grated ginger, black pepper, salt, and red pepper flakes (if using). Mix well until the sugar is dissolved.
3. Marinate the Chicken: Place the chicken breasts in a resealable plastic bag or shallow dish. Pour the marinade over the chicken, ensuring it is well coated. Let it marinate for at least 15 minutes (or up to 2 hours for more flavor).
4. Preheat the Pan: Heat a large skillet over medium-high heat. Add a little olive oil if needed to prevent sticking.
5. Cook the Chicken: Remove the chicken from the marinade, reserving the marinade for later. Cook the chicken in the hot skillet for about 6-7 minutes per side or until fully cooked and golden brown. Use a meat thermometer to ensure the internal temperature reaches 165°F (75°C).
6. Add Pineapple: Once the chicken is cooked, add the pineapple chunks to the skillet. Pour the reserved marinade over the chicken and pineapple. Cook for an additional 3-5 minutes, stirring occasionally, until the sauce thickens and the pineapple is heated through.
7. Garnish and Serve: Remove from heat. Garnish with chopped green onions and sesame seeds if desired.

These steps will guide you in creating this incredible dish effortlessly. The combination of sweet and savory flavors will surely delight everyone at the table.