This lower carb vegetable casserole is a delightful and nutritious dish perfect for those looking to enjoy a hearty meal without the extra carbs. Packed with fresh broccoli, cauliflower, and bell peppers, this casserole is both colorful and flavorful. The creamy cheese sauce ties everything together, making it a comforting choice for any dinner table.
If you don't usually stock up on heavy cream or a variety of bell peppers, you might need to make a quick trip to the supermarket. Heavy cream is essential for creating the rich, creamy texture of the casserole, while the bell peppers add a burst of color and flavor. Make sure to pick up fresh broccoli and cauliflower as well, as they are the main components of this dish.

Ingredients For Lower Carb Vegetable Casserole
Broccoli: Fresh green florets that add a nutritious crunch to the casserole.
Cauliflower: White florets that provide a mild, slightly nutty flavor and a low-carb alternative to starchy vegetables.
Bell peppers: Sliced colorful peppers that add sweetness and a vibrant look to the dish.
Cheese: Shredded cheese that melts into a creamy, gooey topping.
Heavy cream: A rich dairy product that creates a smooth, luxurious sauce.
Garlic: Minced cloves that infuse the casserole with a robust, aromatic flavor.
Salt: Enhances the overall taste of the dish.
Black pepper: Adds a hint of spice and depth to the flavor profile.
Technique Tip for This Recipe
When preparing the broccoli and cauliflower, make sure to cut the florets into uniform sizes to ensure even cooking. Additionally, blanching the vegetables for a couple of minutes in boiling water before mixing them with the other ingredients can help retain their vibrant color and improve their texture in the final dish.
Suggested Side Dishes
Alternative Ingredients
broccoli florets - Substitute with zucchini slices: Zucchini is low in carbs and provides a similar texture when cooked.
cauliflower florets - Substitute with cabbage: Cabbage is also low in carbs and offers a slightly different but still satisfying crunch.
sliced bell peppers - Substitute with sliced zucchini: Zucchini is versatile and low in carbs, making it a great alternative.
shredded cheese - Substitute with nutritional yeast: Nutritional yeast provides a cheesy flavor with fewer carbs and is also vegan-friendly.
heavy cream - Substitute with coconut cream: Coconut cream is lower in carbs and provides a rich, creamy texture.
garlic, minced - Substitute with garlic powder: Garlic powder has a similar flavor profile and is easier to distribute evenly in the casserole.
salt - Substitute with sea salt: Sea salt can offer a more complex flavor and is often less processed.
black pepper - Substitute with white pepper: White pepper has a milder flavor and can add a different depth to the dish.
Other Alternative Recipes Similar to This Dish
How To Store / Freeze This Dish
Allow the casserole to cool completely at room temperature before storing. This helps prevent condensation, which can make the vegetables soggy.
Transfer the cooled casserole to an airtight container. If you don't have one large enough, you can use multiple smaller containers or cover the baking dish tightly with plastic wrap or aluminum foil.
Store the casserole in the refrigerator for up to 4 days. Reheat individual portions in the microwave or the entire dish in the oven at 350°F (175°C) until warmed through.
For freezing, wrap the casserole tightly with plastic wrap and then a layer of aluminum foil to prevent freezer burn. Alternatively, use a freezer-safe airtight container.
Label the container with the date so you can keep track of its freshness. The casserole can be frozen for up to 3 months.
When ready to eat, thaw the casserole in the refrigerator overnight. This gradual thawing helps maintain the texture of the vegetables.
Reheat the thawed casserole in the oven at 350°F (175°C) for about 20-30 minutes or until heated through. If reheating from frozen, it may take up to 60 minutes. Cover with foil if the top starts to brown too quickly.
For a crispy top, remove the foil during the last 10 minutes of reheating. Enjoy your delicious lower carb vegetable casserole!
How To Reheat Leftovers
Oven Method:
- Preheat your oven to 350°F (175°C).
- Place the leftover vegetable casserole in an oven-safe dish.
- Cover the dish with aluminum foil to prevent the cheese from drying out.
- Heat for about 20-25 minutes, or until the vegetables are heated through and the top is bubbly.
Microwave Method:
- Transfer a portion of the casserole to a microwave-safe dish.
- Cover with a microwave-safe lid or a damp paper towel to retain moisture.
- Heat on medium power for 2-3 minutes, stirring halfway through to ensure even heating.
- Check the temperature and heat for an additional minute if necessary.
Stovetop Method:
- Place a non-stick skillet over medium heat.
- Add a small amount of olive oil or butter to the skillet.
- Add the leftover vegetable casserole to the skillet.
- Stir occasionally and heat for about 5-7 minutes, or until the vegetables are heated through.
Air Fryer Method:
- Preheat your air fryer to 350°F (175°C).
- Place the leftover casserole in an air fryer-safe dish.
- Heat for 5-7 minutes, checking halfway through to ensure even heating.
- If the top starts to brown too quickly, cover with a piece of aluminum foil.
Toaster Oven Method:
- Preheat your toaster oven to 350°F (175°C).
- Place the leftover vegetable casserole in a toaster oven-safe dish.
- Cover with aluminum foil to prevent the cheese from drying out.
- Heat for 15-20 minutes, or until the vegetables are heated through and the top is bubbly.
Best Tools for This Recipe
Oven: Used to bake the casserole at 375°F (190°C) until the vegetables are tender and the top is golden brown.
Mixing bowl: Used to combine the broccoli, cauliflower, bell peppers, shredded cheese, heavy cream, minced garlic, salt, and black pepper.
Baking dish: Used to transfer the mixed ingredients and spread them evenly for baking.
Knife: Used to slice the bell peppers and mince the garlic.
Cutting board: Provides a surface to safely cut the vegetables and garlic.
Measuring cups: Used to measure out the broccoli florets, cauliflower florets, sliced bell peppers, shredded cheese, and heavy cream.
Measuring spoons: Used to measure the salt and black pepper.
Spatula: Used to mix the ingredients well in the mixing bowl and to spread the mixture evenly in the baking dish.
How to Save Time on Making This Recipe
Pre-chop vegetables: Cut the broccoli, cauliflower, and bell peppers in advance and store them in the fridge.
Use pre-shredded cheese: Save time by buying shredded cheese instead of shredding it yourself.
Minced garlic: Opt for pre-minced garlic available in jars to skip the chopping.
Mix in the baking dish: Combine all ingredients directly in the baking dish to reduce cleanup time.
Batch cooking: Double the recipe and freeze half for a quick meal later.

Lower Carb Vegetable Casserole
Ingredients
Main Ingredients
- 2 cups Broccoli florets
- 1 cup Cauliflower florets
- 1 cup Sliced bell peppers
- 1 cup Shredded cheese
- 1 cup Heavy cream
- 2 cloves Garlic, minced
- 1 teaspoon Salt
- 1 teaspoon Black pepper
Instructions
- Preheat your oven to 375°F (190°C).
- In a mixing bowl, combine broccoli, cauliflower, and bell peppers.
- Add shredded cheese, heavy cream, minced garlic, salt, and black pepper. Mix well.
- Transfer the mixture to a baking dish and spread evenly.
- Bake for 45 minutes or until the vegetables are tender and the top is golden brown.
- Let it cool for a few minutes before serving. Enjoy!
Nutritional Value
Keywords
Suggested Appetizers and Desserts for This Recipe
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