Smoked Pulled Pork Mac and Cheese

Name: Smoked Pulled Pork Mac and Cheese
Ingredients: 8 tbsp unsalted butter (divided); ½ onion (minced); ½ sweet pepper (chopped); 4 tbsp flour; Salt and pepper; ½ cup chicken stock; 1 ½ cup - 2 cups milk; 1 tbsp spicy brown mustard; ½ tsp cayenne pepper; 5 oz cheddar cheese (shredded); 5 oz pepper jack cheese (shredded); 1 ½ cup shredded pulled pork; 1 cup black beans (rinsed and drained); 8 oz elbow macaroni (cooked al dente and drained); 3 oz monterrey jack cheese (shredded); ½ cup tortilla chips (crushed); 1 tsp paprika; Scallions (assorted peppers, minced red onion and avocado for garnish)