My Creamy Broccoli Cheese Soup is creamy McAlisters Copycat

Ingredients

• 2 tablespoons (30ml) unsalted butter
• 1 medium yellow onion, finely chopped (about 1 cup/150g)
• 2 cloves garlic, minced
• ¼ cup (30g) all-purpose flour
• 4 cups (950ml) vegetable broth
• 2 cups (470ml) whole milk
• 1 teaspoon Dijon mustard
• ½ teaspoon salt, or to taste
• ¼ teaspoon black pepper, or to taste
• 4 cups (about 400g) broccoli florets, cut into bite-sized pieces
• 2 cups (about 200g) shredded cheddar cheese
• Pinch of nutmeg (optional)