Cook your choice of pasta al-dente in salted water. I always use corkscrew pasta, and I cook it for 6 minutes in rapid boiling water. You do NOT want to overcook the pasta, as it will continue cooking in the oven later on. Drain and rinse the pasta under cold water to stop it from cooking. Drizzle a tiny bit of olive oil over the pasta and toss it to keep them from sticking together.
Place a large pot over medium heat. Once hot, add in the olive oil, followed by the diced peppers and onions. Saute them for 4 minutes, stirring occasionally.
Add in the minced garlic and cook for 1 minute, stirring constantly. Add in the cajun seasoning and cook for 1 more minute, stirring constantly.
Add in the butter, and once melted, add in the flour. Stir constantly for 1 1/2 minutes.
Turn the heat down to medium-low and add in half of the milk and stir until smooth. Add in the rest of the milk and stir until smooth.
Add in the Tabasco, liquid smoke, and the cashew cheese sauce you made earlier. Stir to evenly combine everything and cook until the mixture is slowly bubbling.
Add in 2 cups of the shredded cheddar cheese and stir until melted.
Turn the heat off and add in the pasta and sausage. Stir until evenly combined.
Grease a 9-inch round or square baking dish with butter. Scrape the mac and cheese into the dish and spread it around evenly.
Top the mac and cheese with 1/2 cup shredded cheddar cheese and the panko topping.
To bake the mac and cheese, first preheat the oven to 350 degrees Fahrenheit. Next, wrap the top of the dish with a piece of tin foil. Place the dish on the middle oven rack and bake it for 20 minutes. Remove the foil and bake the dish for another 10 minutes. Lastly, turn the broiler on and broil it for 1 to 2 minutes or until evenly golden brown on top.