Cook pasta according to package instructions, leaving it al dente (slightly firm not mushy). Drain well when finished.
Sauté the chopped yellow onion with minced garlic for about 5 minutes until translucent and sweet smelling.
Pour in the tomato sauce, kidney beans, cooked sweet corn, and chili seasoning. Stir and let it simmer for 1 minute.
Add the cooked pasta and fresh baby spinach to the pot. Stir gently until spinach wilts.
Stir in the nutritional yeast. Cook for 2-3 more minutes until everything is warm and melded.
Seal the lid and set the pressure cooker to high for about 5 minutes. Quick release when done. Stir and serve.
Notes
*Chili seasoning: If you don't want to use the homemade chili seasoning, try 1 Tbsp. chili powder + 1 tsp. cumin + 1 tsp. dried oregano + ½ tsp. smoked paprika.