Cook pasta according to package direction. Drain the cooked pasta and return it to the pot.
While the pasta cooks, heat up the olive oil in a small or medium saucepan over medium-high heat. Add onion and cook for 5 minutes until softened.
Add the cornstarch, garlic powder, smoked paprika, mustard powder, turmeric, black pepper, and salt. Stir to combine.
Slowly add the almond milk, whisking as you add it. Cook 3-5 minutes until the mixture thickens, whisking frequently.
Add the nutritional yeast and whisk until smooth.
Add the peas to the pasta. Pour the sauce over the peas and pasta and stir to coat everything. Add more almond milk if you want the sauce to be creamier.