Chicken with Almond-Parsley Pesto

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2 teaspoons olive oil

1/2 cup chopped onion

1 1/4 pounds boneless, skinless chicken breast halves, cut into 1-inch pieces

12 ounces angel hair pasta, cooked

Almond-Parsley Pesto:

1 packed cup fresh parsley leaves

1/3 cup sour cream

1/4 cup freshly grated Parmesan cheese

3 tablespoons olive oil, or more as needed

2 tablespoons toasted slivered almonds

3 cloves garlic

1/2 teaspoon salt