Preheat the oven to 400° F.
Add all of the ingredients for the cashew queso to a blender and blend until smooth. Set aside.
Heat the olive oil in a skillet over medium heat. Once hot, add the onion and cook for 2-3 minutes, until slightly softened.
Add the red bell pepper, corn, and vegan ground beef. Stir and cook for another 3-4 minutes.
Stir in the salsa, diced green chiles, taco seasoning, and salt. Cook for 2-3 minutes more, until everything is heated through. Remove from heat.
Lightly coat a 9-inch round pan (or an 8-inch square pan) with cooking spray. Spread a shallow layer of cashew queso across the bottom.
Place three corn tortillas over the queso, cutting one in half if needed to fit.
Spread half of the filling over the tortillas, then top with about one-third of the remaining cashew queso.
Add another layer of corn tortillas, the remaining filling, and about half of the remaining queso.
Finish with a final layer of corn tortillas and spread the remaining queso on top. Use a spoon to ensure the tortillas are fully covered in sauce to prevent them from drying out while baking.
Bake for 18-20 minutes. Let rest for 5 minutes before serving. Garnish with cilantro, if desired.