Cheesy Broccoli Orzo

Name: Cheesy Broccoli Orzo
Ingredients: 1 tbsp olive oil; 1/2 onion (yellow, chopped small); 1/2 lb broccoli florets; salt (big pinch); 1/2 tsp black pepper; 3 garlic cloves (minced); 1 cup orzo pasta (dried); 2 cups chicken broth or stock (low sodium); 1/2 cup milk; 1 cup cheese (shredded, mild cheddar or colby); 1 tbsp butter