Instant Pot® Chicken Florentine Pasta

Ingredients (10)

• + 1 ½ pounds cubed boneless chicken breast add to pantry
• ✓ 2 teaspoons Cajun seasoning, or to taste
• ✓ 2 tablespoons olive oil
• + ½ medium onion, finely chopped add to pantry
• + 1 (16 ounce) package whole grain penne pasta add to pantry
• + 1 (10 ounce) bag baby spinach leaves add to pantry
• + 2 cups water, or as needed add to pantry
• + 1 pint heavy whipping cream add to pantry
• + 2 ½ tablespoons basil pesto add to pantry
• + 6 ounces grated Parmesan cheese add to pantry