Step 1: Season and Sear the Chicken - Start by seasoning both sides of the chicken breasts with salt, pepper, garlic powder, and onion powder. Heat the oil in a skillet over medium high heat and give the chicken a quick sear for two to three minutes per side. You are not cooking it through here, just building flavor. That golden color adds so much richness to the final dish.
Step 2: Build the Slow Cooker Base - Lay the seared chicken in an even layer in the slow cooker. Scatter the drained pineapple chunks and red bell pepper over the top. I love this part because it already starts looking colorful and inviting.
Step 3: Mix the Sweet Chili Sauce - In a bowl whisk together the sweet chili sauce, soy sauce, brown sugar, rice vinegar, and minced garlic until smooth. Pour it all over the chicken, making sure everything gets coated. This sauce is what transforms into that sticky glaze everybody loves.
Step 4: Slow Cook Until Tender - Cover and cook on low for four to six hours or on high for three to four hours. The chicken should be tender and cooked through. Toward the end your kitchen will smell incredible and the sauce will have thickened into something downright irresistible.
Step 5: Let It Rest and Serve - Once done, let it sit a few minutes before serving. That little rest helps the sauce settle and thicken slightly. Spoon the chicken and plenty of sauce over rice or mashed potatoes and make sure nobody misses those pineapple pieces.