Creating Spicy Pineapple Brown Sugar Chicken is straightforward if you follow these steps:

1. Prep the Chicken: Season the chicken breasts with salt and pepper on both sides.
2. Heat the Oil: In a large skillet, heat olive oil over medium-high heat.
3. Sear the Chicken: Add the chicken breasts to the skillet and cook for 5-7 minutes on each side until golden brown and cooked through. Remove the chicken and set it aside.
4. Make the Sauce: In the same skillet, add minced garlic and ginger. Sauté for 1-2 minutes until fragrant.
5. Add Sugar and Soy Sauce: Stir in the brown sugar, soy sauce, and red pepper flakes. Mix well until the sugar dissolves.
6. Incorporate Pineapple: Add the pineapple chunks to the sauce and cook for 2-3 minutes until they soften slightly.
7. Return Chicken: Place the chicken back into the skillet, coating it with the sauce. Allow it to simmer for 5 minutes, ensuring the chicken absorbs the flavors.
8. Garnish: Remove from heat and garnish with chopped green onions and sesame seeds.
9. Serve: Transfer the chicken and sauce to a serving dish.

These steps will guide you in creating a delightful dish that is sure to impress.