Macaroni recipe in creamy mascarpone cheese sauce

Ingredients

• 2 tablespoons butter
• 1/2 cup all purpose flour (maida)
• 1 cup milk
• 1/2 cup mascarpone cheese (100 gms), recipe here
• 1/4 cup grated cheddar cheese (any variety will do)
• Salt and Pepper to taste
• Macaroni pasta 2 cups
• 1 big green bell pepper, chopped
• 1 big white onion. chopped
• 1 teaspoon olive oil
• Some grated cheese for garnishing