Restaurant style White sauce Pasta

Ingredients: Butter 2 tbsp Garlic 1/2 tbsp Capsicum 1 Onion 1 Boiled Shell macaroni 1 cup Butter 2 tbsp Plain flour 1 tbsp Milk 1/2 glass Crush red chilli 1 tsp Black pepper powder 1 tsp Orgeno 1/2 tsp Chadder Cheese 3-4 tbsp