Cook the pasta in boiling salt water according to the packet instructions until al dente. Drain and set aside. → IMPORTANT: Don’t overcook. The pasta will bake for an additional 10 minutes! If you reduce the cooking time to -1 minute, you will be on the safe side.
Heat the butter in a small saucepan. Add thyme and panko and roast until golden brown and fragrant. Set aside.
Meanwhile, add all ingredients for the cheese sauce to a blender and blend until smooth.
Toss pasta with cheese sauce and pour into a baking dish (6 x 9 inches | 15 x 23cm). Sprinkle with the toasted panko breadcrumbs.
Bake for 10 minutes in the preheated oven. → The vegan cheese sauce thickens quite a bit during baking.
Notes
Cashew nuts don't need to be soaked if you have a high-speed blender. However, if you only have an immersion blender or a blender with low speed, presoak them for 10 minutes in hot water.
Panko: I highly recommend using panko for this recipe. Those Japanese breadcrumbs are coarser and crispier than regular breadcrumbs. However, if you don't have panko at hand, replace it with regular breadcrumbs.
Store leftovers directly in the baking dish (e.g., covered with plastic wrap or aluminum foil – easiest for later reheating) or in an airtight container in the fridge. Stays fresh for 2-3 days.
Reheat for 10 minutes in a preheated oven at 400°F (200°C).