Sausage & Veggie Breakfast Pizza

Name: Sausage & Veggie Breakfast Pizza
Ingredients: 1 english muffin (separated); 1/2 tbsp butter (room temperature); 2 oz sausage (crumbled, I used a mild ground sausage); 2 tbsp mozzarella cheese (shredded); 1/4 red bell pepper (diced small); salt (a pinch); pepper (to taste); parsley (garnish)