Cheddar Bay Biscuit Casserole

This casserole turns the garlicky, cheesy biscuits everyone fights over into a full dinner. A creamy chicken and vegetable filling bakes under a blanket of fluffy Cheddar Bay biscuit topping, and the whole thing comes together with a rotisserie chicken and a box of biscuit mix.

You get the same crackly, buttery crust you know from the restaurant basket, but now it sits on top of a warm, savory filling that needs nothing more than a green salad on the side. It is the kind of dish that makes a weeknight feel far less ordinary.

What Makes This Casserole So Good

Most biscuit-topped casseroles rely on canned dough that turns out doughy in the middle. Cooking the filling first is not necessary here because the biscuit topping bakes at a high temperature until deep golden, giving you a crisp, garlic-brushed top layer and a creamy, hot filling underneath.

The sharp cheddar in the biscuit dough and the garlic-herb butter brushed on at the end are what seal the deal. You get pockets of melted cheese in every bite of the topping, and the seasoning packet that comes with the mix gives you that familiar pop of garlic and parsley without any extra work.

Ingredients

• 1 box (11.36 oz) Cheddar Bay biscuit mix: includes the garlic-herb seasoning packet.
• 1 cup sharp cheddar cheese, shredded: for the biscuit topping; measure loosely packed.
• 6 tbsp unsalted butter, divided: 4 tbsp melted for the dough, 2 tbsp melted for the garlic butter finish.
• 1/2 cup cold water: for the biscuit dough.
• 2 cups cooked shredded chicken: a rotisserie chicken makes this quick.
• 1 can (10.5 oz) condensed cream of chicken soup: undiluted; cream of mushroom or celery also work.
• 1/2 cup sour cream: full fat keeps the filling rich.
• 1 cup frozen mixed vegetables: peas, carrots, and corn, no need to thaw.
• 1/2 tsp garlic powder
• 1/2 tsp onion powder
• 1/2 tsp kosher salt, plus more to taste
• 1/4 tsp black pepper

Variations / Substitutions

• Use shrimp: Swap the chicken for 2 cups cooked small shrimp and use cream of shrimp soup if you have it.
• Go vegetarian: Omit the chicken, double the mixed vegetables, and use cream of mushroom soup.
• Try a different cheese: A sharp white cheddar or pepper jack gives the biscuit topping a little more punch.
• Add fresh herbs: Stir a tablespoon of chopped fresh parsley or chives into the filling for a brighter finish.

If you want the biscuit topping without a box mix, check out my drop biscuit recipe for a from-scratch version that you can season with garlic and cheddar.

How To Make Cheddar Bay Biscuit Casserole

Step 1: Mix the Filling

Preheat the oven to 400°F (200°C) and grease a 9×13-inch baking dish. In a large bowl, stir together the 2 cups shredded chicken, the can of condensed cream of chicken soup, 1/2 cup sour cream, 1 cup frozen mixed vegetables, 1/2 tsp garlic powder, 1/2 tsp onion powder, 1/2 tsp salt, and 1/4 tsp pepper until everything is evenly combined. Taste the mixture and add a little more salt if it needs it, keeping in mind the biscuit topping will bring its own salt and cheese.

The filling will look thick and pale with speckles of vegetables. You are not cooking it at this point, just bringing it together so it heats through evenly in the oven.

Step 2: Prepare the Biscuit Topping

Pour the biscuit mix from the box into a medium bowl and set the seasoning packet aside. Stir in the 1 cup shredded cheddar cheese until the cheese is coated with the dry mix. Add 1/2 cup cold water and 4 tablespoons of the melted butter, then stir with a fork just until a soft, shaggy dough forms. Stop as soon as the flour disappears.

The dough will be lumpy and very sticky. That is exactly what you want. Overworking it makes the biscuits tough, so a few dry streaks are better than a smooth dough.

Step 3: Assemble the Casserole

Scrape the chicken filling into the prepared baking dish and spread it into an even layer with the back of a spoon. Use two spoons or a small scoop to drop heaping spoonfuls of the biscuit dough all over the top. A little space between the mounds is fine because they will spread as they bake.

You should end up with about 10 to 12 uneven dollops. They will look rustic, not tidy, and the filling will still peek through in several spots. That is how you get a mix of creamy bites and biscuit crunch.

Step 4: Bake the Casserole

Slide the dish into the hot oven and bake for 22 to 25 minutes. The filling should be bubbling around the edges, and the biscuit topping should be puffed and deeply golden on top. A toothpick inserted into the center of a biscuit should come out clean, not wet.

The high oven heat gives you a browned, crisp top while the steam cooks the filling all the way through. If the biscuits start to darken too fast before the time is up, lay a piece of foil loosely over the dish for the last few minutes.

Step 5: Brush with Garlic Butter

While the casserole bakes, stir the reserved seasoning packet into the remaining 2 tablespoons of melted butter. As soon as the dish comes out of the oven, brush the garlic-herb butter all over the hot biscuit topping. Let the casserole sit for 5 minutes before scooping.

The butter will sizzle and settle into the cracks, giving you that glossy, savory finish on every piece of the biscuit layer. Serve it right from the dish at the table.

A Few Notes Before You Start

• Resist the urge to overmix the biscuit dough.: A light hand keeps the topping tender instead of dense.
• Rotisserie chicken saves time, but leftover roasted chicken or even poached chicken breasts work just as well.
• The filling will look loose before baking.: Do not be tempted to drain the vegetables or reduce the liquid. The biscuit topping absorbs some moisture as it bakes, and the final texture is creamy, not soupy.
• Let the casserole rest for a full 5 minutes after brushing with butter.: This short wait helps the filling set enough to plate neatly.

Halving the recipe is easy for a smaller household.

Ingredient	Full (9×13-inch dish)	Half (8×8-inch dish)
Biscuit box size	1 full box (11.36 oz)	1/2 box (about 5.7 oz)
Shredded cheddar	1 cup	1/2 cup
Butter, total	6 tbsp	3 tbsp
Shredded chicken	2 cups	1 cup
Cream of chicken soup	1 can (10.5 oz)	~3/4 cup
Sour cream	1/2 cup	1/4 cup
Frozen mixed vegetables	1 cup	1/2 cup
Bake time	22–25 mins	18–22 mins

Storing Leftover Casserole

• Refrigerate: Cover the baking dish or transfer portions to an airtight container and keep in the fridge for up to 3 days. The biscuit topping will soften but still tastes great.
• Reheating: Warm individual servings in the microwave until hot, or cover the whole dish with foil and reheat in a 350°F oven for 15–20 minutes. The oven method gives the biscuit layer back some of its crisp edges.

What To Serve With Cheddar Bay Biscuit Casserole

A crisp green salad with a tangy vinaigrette cuts through the richness of the creamy filling. Lightly steamed green beans or roasted broccoli with a squeeze of lemon also work, because their fresh, bright flavor balances the buttery biscuit topping without competing with it.

Frequently Asked Questions

Can I use cream of mushroom soup instead?

Yes, cream of mushroom or cream of celery soup will work just as well and give the filling a slightly earthier flavor.

Can I make this casserole ahead of time?

Assemble the filling and spread it in the dish, then cover and refrigerate for up to 24 hours. Wait to mix the biscuit dough and top the casserole until you are ready to bake, and add 3–5 minutes to the bake time since the filling will be cold.

What if I do not have a box of Cheddar Bay biscuit mix?

Use your favorite drop biscuit recipe and stir in 1 cup shredded cheddar, 1/2 tsp garlic powder, and 1/2 tsp dried parsley. For the garlic butter, melt 2 tbsp butter with a pinch of garlic powder and dried parsley and brush it on after baking.

Can I freeze this casserole?

Yes, cool the baked casserole completely, wrap it tightly, and freeze for up to 2 months. Thaw overnight in the fridge and reheat covered in a 350°F oven until hot all the way through.