Save a few bucks and skip the take-out. You can make delicious sweet and sour chicken right at home!
Combine the egg whites with 1 tablespoon of cornstarch in a large bowl, stirring with a whisk. Add the chicken to bowl and toss to coat.
Combine the remaining teaspoon of cornstarch with ketchup and the next 4 ingredients (through soy sauce) in a bowl, stirring with a whisk.
Heat a big nonstick skillet over medium-high heat. Add 1 tablespoon of oil to the pan and swirl around to coat. Add bell pepper to pan and cook for 2 minutes, stirring frequently. Add pineapple, ginger, and onions to pan and continue cooking for another 2 minutes, stirring occasionally. Transfer bell pepper mixture to a plate.
Add the remaining tablespoon of oil to the pan. Add the chicken mixture, allowing any excess egg white mixture to drip back into the bowl. Stir-fry the mixture for 6 minutes or until the chicken is browned and done. Add the ketchup mixture and bell pepper mixture to pan. Bring the whole thing to a simmer and let it do its thing for 1 minute or until slightly thickened. Sprinkle with salt and serve immediately.