Chicken Sausage without andouille apples

1 pound uncooked penne (tube-shaped pasta) 1 tablespoon olive oil 1 1/2 cups chopped onion 3/4 cup chopped red bell pepper 1 (12-ounce) package sweet basil[...]

3 ounces chicken apple sausage, chopped (such as Gerhard's) 2 teaspoons olive oil 1 1/2 cups vertically sliced Oso Sweet or other sweet onion 1 cup thinly[...]