Kale Puttanesca

Ingredients

• 1/2 package whole-wheat angel hair pasta
• 2 tablespoons olive oil
• 1/2 large onion , sliced
• 2 cloves garlic , minced
• 1 teaspoon red pepper flakes
• 1 tablespoon drained capers
• 1 can anchovy fillets , drained and quartered
• 1 cup canned diced tomatoes , undrained
• 2 cups coarsely chopped kale
• 1 can sliced black olives , drained
• 1/2 cup grated Parmesan cheese , or to taste