Cook pasta according to package instructions. Drain and set aside.
Heat oil in a medium saucepan over medium heat then add flour. Whisk together for a couple minutes until it starts to bubble.
Add in the milk slowly while continuing to whisk then add in garlic powder, powder, jalapeño and salt and pepper. Reduce heat to low and cook until sauce thickens (approx 8 minutes) while stirring frequently.
Remove pan from heat and stir in nutritional yeast until sauce is smooth.
Pour sauce over cooked pasta and mix well.