Cut 1 pound chicken boneless skinless breast into bite sized pieces.
Put the cubed chicken, 3 teaspoons minced garlic, 1 teaspoon Dijon mustard, ½ cup sliced sun-dried tomatoes, 2 tablespoons tomato paste, 2 teaspoons Italian seasoning, ½ teaspoon salt, and ½ teaspoon ground black pepper into your Instant Pot. Pour in the 4 cups chicken stock and stir to combine.
Add the 2 cups penne pasta and push down a bit to make sure all of the pasta and chicken are covered by the chicken stock.
Put the cover on the pressure cooker and make sure the valve is in the seal position. Cook on high pressure for 5 minutes.
Quick release the pressure. (Covering the vent with a damp cloth will help catch any starchy splatter.)
Add the 5 ounces baby spinach, 1 cup heavy cream and 1 cup grated Parmesan cheese. Stir to combine. Put the lid back on the pot and allow the heat from the pasta to melt the cheese and wilt the spinach.
Serve with additional cheese, red pepper flakes and fresh basil if desired.
Notes
Store leftovers in an airtight container in the refrigerator for up to 4 days or in the freezer for up to 3 months.