Heat 1 cup of oil in a skillet over medium-high heat for frying.

Season the chicken pieces with salt and pepper, then coat them evenly with 1 cup of flour.

Fry the chicken pieces in the hot oil until they are crispy and golden brown.

Remove them from the skillet and drain on paper towels.

In the same skillet, drain excess oil, leaving a small amount.

Add the sliced onion and bell pepper, and sauté for about 5 minutes until they are slightly softened.

Sprinkle 1 tablespoon of flour over the onions and peppers, and stir well to combine.

Return the fried chicken to the skillet, and continue to sauté for an additional 5 minutes, allowing the flour to coat the chicken and vegetables.

Pour the sweet and sour sauce over the chicken and vegetables in the skillet.

Stir to coat evenly.

Cover the skillet and allow the mixture to simmer for 15 minutes, stirring occasionally.

Serve the crispy sweet and sour chicken over rice.