Cook the gluten-free pasta according to the package instructions until al dente. Drain and set aside.
In a large skillet, heat the olive oil over medium heat. Add the vegan chicken substitute and sauté until it begins to brown, about 5 minutes. Remove from the skillet and set aside.
In the same skillet, add the dairy-free butter and minced garlic. Sauté for about 1 minute until fragrant.
Sprinkle the gluten-free all-purpose flour over the garlic and butter, whisking constantly to create a roux. Cook for 2-3 minutes until the roux becomes a light golden color.
Slowly pour in the unsweetened almond milk while continuing to whisk. Cook for another 2-3 minutes, allowing the sauce to thicken.
Stir in the nutritional yeast, dried basil, dried oregano, salt, and pepper. Mix until well combined.
Add the mixed vegetables and frozen peas to the skillet. Cook for 5-7 minutes, or until the vegetables are tender but still vibrant.
Return the cooked vegan chicken substitute to the skillet and toss everything together.
Add the cooked gluten-free pasta to the skillet and gently stir to coat the pasta and vegetables with the creamy sauce.
Cook for an additional 2-3 minutes to heat through.
Taste and adjust the seasoning with more salt and pepper if needed.
Serve the Gluten-Free Vegan Chicken Pasta Primavera hot, garnished with fresh basil or parsley if desired.