Step 1: Season the Chicken - Add the bite sized chicken pieces to a large bowl and sprinkle them with the salt and black pepper. Toss everything together until the chicken is evenly seasoned. This small step matters because the sauce is delicious, but seasoning the chicken itself keeps every bite from tasting flat underneath that sticky coating.
Step 2: Set Up the Coating Station - Crack the eggs into a medium bowl and whisk them until smooth. Pour the cornstarch into a separate shallow bowl or pie plate. Keeping the egg and cornstarch in separate dishes makes the coating process much easier, especially when you are moving through a full two pounds of chicken.
Step 3: Coat the Chicken Pieces - Working with a few chicken pieces at a time, dip them into the beaten egg and let any extra egg drip away. Then roll them through the cornstarch until they are completely coated. Place the coated chicken on a plate while you finish the rest. Do not worry if it looks a little powdery at this point. That coating will turn into a delicate golden shell once it hits the hot oil.
Step 4: Lightly Fry Until Golden - Heat about 1 inch of vegetable oil in a large skillet over medium high heat. Fry the chicken in batches for 2 to 3 minutes, just until the outside is lightly golden. You are not trying to cook the chicken all the way through here. The slow cooker will finish that job, and keeping this fry brief helps the chicken stay tender instead of getting tough. Move the fried chicken to a paper towel lined plate as each batch comes out. Give the oil a minute to return to temperature between batches so the chicken stays light rather than greasy.
Step 5: Add the Chicken and Vegetables - Place the lightly fried chicken in the bottom of your slow cooker. Scatter the red bell pepper chunks, onion chunks, and drained pineapple over the top. I like using bigger vegetable pieces because they soften beautifully in the sauce while still holding their shape when you scoop everything onto rice.
Step 6: Whisk the SweetFire Sauce - In a bowl, whisk together the sweet chili sauce, reserved pineapple juice, soy sauce, rice vinegar, brown sugar, and minced garlic. Give it a good stir until the brown sugar dissolves and the sauce looks smooth. It should smell sweet, garlicky, and a little tangy, which is exactly what you want before it slowly wraps around the chicken and vegetables. Pour the sauce evenly over everything in the slow cooker. There is no need to stir aggressively at this stage. The sauce will settle down through the ingredients as it cooks.
Step 7: Let the Slow Cooker Work - Cover the slow cooker and cook on low for 3 to 4 hours or on high for 1½ to 2 hours. The chicken is ready when it is cooked through, the vegetables are tender, and the pineapple has warmed all the way through. I usually choose low when the afternoon allows it because the slower pace gives the sauce time to settle into the chicken.
Step 8: Thicken the Glossy Sauce - During the final 20 minutes of cooking, whisk the 1 tablespoon cornstarch with the cold water in a small bowl until completely smooth. Stir the slurry gently into the slow cooker, then cover it again and let it cook until the sauce thickens. You are looking for a glossy coating that clings to the chicken, peppers, onions, and pineapple instead of pooling thinly at the bottom.
Step 9: Toss and Garnish - Once the sauce has thickened, gently toss everything together with a large spoon. Take your time here so the chicken keeps its coating and the peppers stay in nice pieces. Spoon the SweetFire chicken over steamed white rice, then finish each serving with sliced green onions and sesame seeds. That fresh green topping makes the whole bowl look like a dinner worth sitting down for.