Cut the chicken breasts into bite-sized pieces, season with salt and pepper, and toss with cornstarch.
Heat the oil in a skillet over medium-high heat and fry the chicken pieces until golden brown. Transfer to a paper towel-lined plate to drain excess oil.
Cut the bell peppers, pineapple, and onion into even-sized pieces. Grate the garlic and ginger.
In another skillet, heat a little oil and sauté the onion, garlic, and ginger until fragrant, then add the bell peppers.
Add the pineapple pieces, then pour in the sweet and sour sauce. Bring to a simmer and let the flavors meld.
Return the fried chicken pieces to the sauce and simmer over low heat for another 5 minutes, allowing all the pieces to be coated and infused with the flavors.
Serve the sweet and sour chicken with steamed jasmine rice, garnished with fresh scallions or sesame seeds.
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