Gather all ingredients. Dotdash Meredith Food Studios
Melt 1 tablespoon butter in a skillet over medium high heat. Add onion; cook and stir until tender and translucent, about 5 minutes. Set aside. Dotdash Meredith Food Studios
Whisk 1/4 cup melted butter and flour together in a large saucepan over medium low heat. Continue to whisk and cook, adding 1 to 2 tablespoons of milk if necessary to keep the flour from burning, 3 to 4 minutes. Dotdash Meredith Food Studios
Gradually add milk while whisking constantly; stir in chicken stock and bring to a simmer. Dotdash Meredith Food Studios
Cook until mixture is thickened, about 15 to 20 minutes. Dotdash Meredith Food Studios
Add broccoli, carrots, celery, and sautéed onion; simmer until all the vegetables are tender, about 10 to 15 minutes. Dotdash Meredith Food Studios
Stir in Cheddar cheese until melted; season with salt and pepper to taste before serving. Dotdash Meredith Food Studios
Copycat Panera Broccoli Cheddar Soup · Dinner Match Lab | Dinner Match Lab