Sweet and Sour Chicken

I got this recipe off of the Food Network, courtesy of Cathy Lowe. It's pretty easy and yummy.

2 Tbsp vegetable oil
2 boneless chicken breasts, sliced into strips (I cubed mine)
salt and pepper
1/2 cup chopped red pepper
1/2 cup chopped green pepper
4 tsp cornstarch mixed with 4 tsp water
1 cup canned pineapple chunks, drained with 1/2 cup reserved juice
3 Tbsp light brown sugar
3 Tbsp rice wine vinegar
1/4 cup chicken stock

In a large non-stick skillet, heat oil over medium high heat. Season chicken and add to pan. Brown chicken and remove to plate. Add red and green peppers and cook for 1 minute. Stir in pineapple chunks, juice, sugar, vinegar and chicken stock and bring to a simmer. Simmer until sauce begins to reduce. Stir in cornstarch mixture and bring liquid to a simmer. Stir in chicken and cook for 5 minutes. Serve over rice.