Creamy Gluten-Free Broccoli Cheddar Soup Recipe

There’s nothing better than a big bowl of comforting broccoli cheddar soup, and this gluten-free version delivers everything you want: a rich, savory base built from butter, onion, and garlic; tender broccoli and shredded carrots simmered in gluten-free vegetable broth; a splash of half and half for creaminess; and a generous handful of sharp cheddar for that classic cheesy finish. Instead of a flour-based roux, a simple cornstarch slurry thickens the soup cleanly and quickly. The whole pot comes together in about 35 minutes and yields a spoon-coating, creamy texture with plenty of broccoli pieces to give each bite satisfying structure—perfect for fast weeknight dinners that still feel like a treat.

Why Cornstarch Beats a Roux for This Soup

Many broccoli cheddar recipes rely on a butter-and-flour roux to thicken the base. That works, but it adds a step and can introduce lumps or a raw-flour taste if the gluten-free flour blend doesn’t dissolve smoothly. I tested both methods and found the cornstarch slurry gives the same thickness with a cleaner cheese flavor. The key is mixing the cornstarch with cold water until perfectly smooth before adding it to the hot liquid—add it dry and you’ll get clumps. You’ll know the vegetables are ready for the next step when they’re fork-tender and the broccoli has softened from bright green to a softer, muted green across the pot.

Gluten-Free Cooking Tips

• Shred the cheese yourself. Freshly shredded cheddar melts into a glossy, smooth soup. Pre-shredded cheese is often coated with anti-caking starch that makes the texture slightly grainy.
• Don’t overblend. Partially blending the soup with an immersion blender keeps small bits of broccoli and carrot intact for texture. Blend until roughly half the soup is smooth, then stop.
• Add cheese low and slow. Reduce the heat to low and stir in shredded cheddar a handful at a time, letting each addition melt fully. Adding cheese too quickly over higher heat can make the soup separate or become greasy.

Gluten-Free Broccoli Cheddar Soup

Ingredients

• 2 Tbsp (28 g) butter
• 1 small yellow onion, diced
• 2 cloves garlic, minced
• 3 cups (300 g) broccoli florets, chopped
• 1 cup (100 g) shredded carrots
• 3 cups (720 ml) gluten-free vegetable broth
• 2 cups (480 ml) half and half
• 2 cups (200 g) shredded white or yellow sharp cheddar cheese
• 2 Tbsp (16 g) cornstarch
• 2 Tbsp (30 ml) water
• ½ tsp salt (adjust to taste)
• ¼ tsp black pepper

Instructions

1. Sauté aromatics: In a medium Dutch oven or pot, melt the butter over medium heat. Add the diced onion and cook 4–5 minutes until softened. Add minced garlic and cook 1 minute more, until fragrant.
2. Simmer the vegetables: Add the chopped broccoli, shredded carrots, and vegetable broth. Bring to a simmer and cook 10–12 minutes, until the vegetables are fork-tender and the broccoli color has deepened. Use an immersion blender to partially blend the soup—blend until roughly half is smooth and leave some pieces whole for texture.
3. Add the dairy: Stir in the half and half and bring the soup back to a gentle simmer over moderate heat—do not boil hard.
4. Thicken with slurry: In a small bowl, whisk the cornstarch and cold water until completely smooth. Stir the slurry into the simmering soup and cook 2–3 minutes until slightly thickened and coating a spoon.
5. Melt in the cheese: Reduce heat to low. Add the shredded cheddar a handful at a time, stirring and allowing each addition to melt before adding more. Season with salt and pepper to taste. Serve warm.

Notes

• The broth and cheddar can be high in sodium—taste before adding the full amount of salt. A low-sodium broth gives you more control.
• If using frozen broccoli, drain excess water or simmer a bit longer; frozen broccoli releases extra liquid that can thin the soup.
• Add a pinch of cayenne or hot sauce for heat, or set out red pepper flakes so each person can season their bowl.
• For a lighter version, swap half and half for whole milk or use extra broth; the soup will be slightly thinner but still flavorful.

Nutrition

How to Make Gluten-Free Broccoli Cheddar Soup Step by Step

Gather all ingredients before you start: butter, onion, garlic, broccoli, shredded carrots, gluten-free broth, half and half, sharp cheddar, cornstarch, water, salt, and pepper. Having everything prepped speeds the process and ensures even cooking.

Cook the aromatics: Melt 2 tablespoons butter in a medium Dutch oven over medium heat. Add one diced small yellow onion and sauté until translucent, about 4–5 minutes. Stir in two minced garlic cloves and cook another minute until fragrant.

Simmer the vegetables: Add 3 cups chopped broccoli, 1 cup shredded carrots, and 3 cups gluten-free vegetable broth. Simmer 10–12 minutes until fork-tender. Use an immersion blender to partially puree the soup so it retains some chunkiness—stop when about half the pot is smooth.

Stir in the dairy: Pour in 2 cups half and half and bring the soup back to a gentle simmer. Keep the heat moderate to avoid boiling the dairy.

Thicken with the slurry: Whisk 2 tablespoons cornstarch with 2 tablespoons cold water until completely smooth. Stir into the simmering soup and cook 2–3 minutes until the mixture thickens and coats a spoon.

Melt in the cheese: Lower the heat to low and add 2 cups shredded sharp cheddar a handful at a time, stirring until each addition has melted before adding more. Finish with ½ teaspoon salt and ¼ teaspoon black pepper, adjusting to taste.

Serve: Ladle hot soup into bowls and top with extra shredded cheddar, a crack of black pepper, or chopped fresh chives for color and brightness.

Storage & Freezing Instructions

Store cooled soup in an airtight container in the refrigerator for up to 4 days.

Freezer

Dairy-based soups can separate after freezing. If you plan to freeze, cool completely and freeze in an airtight container for up to 2 months. Expect some separation on thawing; it typically recombines with gentle reheating and stirring.

Reheating

Reheat gently over low heat, stirring often until warmed through. Avoid boiling, which can cause the dairy to separate. If the soup appears slightly broken after freezing, a vigorous whisk while reheating or a splash of broth or milk will bring it back together.

Make Ahead

You can cook the recipe through the vegetable simmer step a day in advance. Refrigerate, then bring back to a gentle simmer and finish with half and half, the cornstarch slurry, and the cheese just before serving for the best texture.

How I Like to Round Out the Meal

This soup pairs beautifully with warm gluten-free dinner rolls or slices of gluten-free bread for dipping. A grilled cheese made with gluten-free bread makes the meal heartier and adds a satisfying crunch. If you prefer a lighter option, serve with a simple green salad and vinaigrette to balance the richness. For added texture, top bowls with gluten-free croutons or a sprinkle of extra cheddar.

More Gluten-Free Soups to Try

• Gluten-Free Potato Soup: A cozy, cheesy alternative with a similar fork-tender, partially blended texture.
• Gluten-Free Cream of Mushroom Soup: A creamy soup that’s also useful as a homemade pantry staple or casserole base.
• Gluten-Free Tomato Soup: A kid-friendly favorite that uses the same easy one-pot approach.
• Gluten-Free Chicken Noodle Soup: A soothing, simple one-pot meal for colder nights or when you need comfort.