Sourdough Discard Mac and Cheese: Ultra Creamy with a Golden Crunch

Ashly’s Story & Why This Recipe Works

There’s something magical about pairing sourdough discard with cheese. I discovered this recipe during a cold winter week at my restaurant, when we had leftover gruyere and a bucket of discard no one wanted to toss. I blended the tang of sourdough into the roux and added a crunchy discard breadcrumb topping and the staff devoured every bite. As a professionally trained chef who’s been baking with discard since age seven, this sourdough discard mac and cheese is a go-to in my kitchen. It’s creamy, comforting, and uses every last bit of your starter.

Sourdough Discard Mac and Cheese: Ultra Creamy with a Golden Crunch

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Ultra creamy sourdough discard mac and cheese with sharp cheddar, nutty gruyere, and a golden sourdough breadcrumb crust. Comfort food meets zero waste.

• Author: Ashly Martin
• Prep Time: 20 minutes
• Cook Time: 30 minutes
• Total Time: 50 minutes
• Yield: 8 servings 1x
• Category: Dinner
• Method: Baking
• Cuisine: American
• Diet: Vegetarian

Ingredients

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16 oz elbow pasta

¼ cup unsalted butter

¼ cup all-purpose flour

½ cup sourdough discard (unfed)

1½ cups whole milk

2½ cups half and half

4 cups sharp cheddar, shredded

2 cups gruyere, shredded

1½ tsp salt

½ tsp black pepper

Topping:

1½ cups sourdough breadcrumbs

4 tbsp butter, melted

½ cup parmesan, shredded

¼ tsp paprika

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Instructions

1. Preheat oven to 350°F and grease a 3-qt baking dish.

2. Cook pasta 1 minute shy of al dente. Drain and toss with a little oil.

3. Whisk milk and discard together until smooth.

4. In a pot over medium heat, melt butter and whisk in flour. Cook 1 minute.

5. Slowly whisk in half and half, then discard mixture. Cook until thickened.

6. Remove from heat. Stir in 5 cups of cheese until melted.

7. Mix cheese sauce with pasta. Layer half in dish, add extra cheese, top with remaining pasta.

8. Mix breadcrumbs, butter, parmesan, and paprika. Sprinkle on top.

9. Bake 30 minutes until bubbly and golden. Rest 5–10 minutes before serving.

Notes

Use freshly grated cheese for smoothest texture.

Undercook pasta slightly to prevent mushiness after baking.

Sourdough discard adds tangy flavor and richness without waste.

Nutrition

• Serving Size: 1 cup
• Calories: 520
• Sugar: 3g
• Sodium: 590mg
• Fat: 32g
• Saturated Fat: 18g
• Unsaturated Fat: 12g
• Trans Fat: 0g
• Carbohydrates: 38g
• Fiber: 2g
• Protein: 20g
• Cholesterol: 85mg

Ingredients for Sourdough Discard Mac and Cheese

Why Sourdough Discard Belongs in Mac and Cheese

Unfed sourdough discard makes an incredible thickener and flavor booster in cheese sauces. It blends beautifully with flour and dairy to form a roux that’s tangy, creamy, and satisfying. Even better? It makes this dish feel artisanal and resourceful.

What You’ll Need

For the Mac and Cheese:

• 16 oz elbow pasta
• ¼ cup unsalted butter
• ¼ cup all-purpose flour
• ½ cup sourdough discard (unfed)
• 1½ cups whole milk
• 2½ cups half and half (or 1 cup cream + 1½ cups milk)
• 4 cups sharp cheddar, shredded
• 2 cups gruyere, shredded
• 1½ tsp salt
• ½ tsp black pepper

For the Breadcrumb Topping:

• 1½ cups sourdough breadcrumbs (fresh or toasted)
• 4 tbsp butter, melted
• ½ cup parmesan, shredded
• ¼ tsp paprika (or garlic/mustard powder)

Essential Tools for Your Sourdough Discard Mac and Cheese Recipe

• Dutch oven or heavy-bottomed pot
• Whisk
• 3-quart baking dish
• Cheese grater
• Mixing bowls
• Food processor (for breadcrumbs)

How to Make Sourdough Discard Mac and Cheese

Step-by-Step Instructions

1. Preheat & Prep
   Preheat oven to 350°F. Grease a 3-quart baking dish. Shred cheeses and set aside.
2. Cook the Pasta
   Boil elbow pasta in salted water until 1 minute shy of al dente. Drain, toss with a little oil, and set aside.
3. Make the Sourdough Roux
   In a measuring cup, whisk milk and sourdough discard until smooth. In a Dutch oven over medium heat, melt butter and whisk in flour. Cook 1 minute.
4. Build the Sauce
   Gradually whisk in half and half, then milk/discard mixture. Stir constantly until thickened and bubbling. Add salt and pepper.
5. Add the Cheese
   Remove from heat. Stir in 5 cups of shredded cheese in batches until smooth and melty.
6. Assemble the Casserole
   Combine pasta and cheese sauce. Pour half into the dish, layer with extra cheese, then top with remaining mixture.
7. Breadcrumb Topping
   Mix breadcrumbs, melted butter, parmesan, and paprika. Sprinkle generously on top.
8. Bake Until Bubbly
   Bake 30 minutes or until golden brown and bubbling. Cool slightly and serve warm.

Expert Tips for Sourdough Discard Mac and Cheese

Texture, Tang & Technique

• Use freshly shredded cheese for smoother melting.
• Discard too thick? Loosen with 1–2 tbsp milk before mixing.
• Gruyere adds nutty balance, but smoked gouda or mozzarella work too.
• Breadcrumbs too chunky? Blitz again after toasting for a finer crust.
• Let it rest 5–10 minutes before serving—this sets the cheese sauce.

Personalize Your Sourdough Discard Mac and Cheese: Variations and Substitutions

• Add-ins: Try cooked broccoli, pulled smoked meat, or roasted mushrooms.
• Flour-Free: Use cornstarch (1:1) if avoiding gluten in roux.
• Cheese Swap: Monterey Jack, fontina, or smoked gouda = melt perfection.
• Topping Alternative: No time? Panko breadcrumbs work in a pinch.
• Non-Dairy Option: Sub plant-based milk and vegan cheese, skip parmesan.

Avoid Pitfalls: Common Mistakes & Solutions for Your Sourdough Discard Mac and Cheese

• Grainy sauce? Cheese added too hot remove from heat first.
• Oily top? Pre-shredded cheese contains anti-caking agents. Grate it fresh.
• Dry mac? Pasta overcooked or not enough sauce. Stop at al dente and keep sauce creamy.

How to Serve Your Sourdough Discard Mac and Cheese: Ideal Accompaniments

• Serve alongside sourdough discard biscuits, garlic green beans, or a crisp arugula salad.
• Great with grilled vegetables or as a base for baked mac bowls with pulled chicken.

Storage & Reheating Sourdough Discard Mac and Cheese

Keep It Creamy, Not Clumpy

• Fridge: Store in an airtight container for up to 4 days.
• Freezer: Freeze in single portions for 2–3 months. Thaw overnight in fridge.
• Reheat: Add a splash of milk/cream and stir often. Microwave in short bursts or reheat in the oven at 325°F covered.

FAQs About Sourdough Discard Mac and Cheese

How to use sourdough discard in a recipe?

Sourdough discard can act as a thickener, flavor enhancer, or rise booster. In mac and cheese, it replaces part of the roux and adds tang and creaminess.

How do you get sourdough discard?

Discard is what’s removed from your sourdough starter before feeding. Save it in the fridge (up to 1 week) and use in savory or sweet recipes.

How to discard sourdough starter properly?

Remove half of your starter before each feeding to prevent overgrowth. Discard can be composted or reused in recipes like this mac and cheese.

How do you activate sourdough discard?

Feed it equal parts flour and water. Let it sit at room temperature 4–6 hours until bubbly if you want to reactivate it for baking with rise.

Conclusion

This sourdough discard mac and cheese is comfort food redefined cheesy, tangy, and topped with a crisp, golden crown of sourdough breadcrumbs. It transforms something as humble as starter waste into something you’ll crave weekly. Whether it’s the main event or the best side dish at the table, this recipe proves that discard deserves the spotlight.