Directions1. Get Ready to Bake: Preheat your oven to 375°F (190°C). Lightly grease a 9x9-inch or similar-sized baking dish. 2. Whip Up the Spicy Cream Sauce: In a microwave-safe bowl, combine the heavy cream, butter, garlic powder, and xanthan gum. Microwave on high for 60 seconds, or until the butter has fully melted.
Whisk the mixture vigorously until it's smooth and has started to thicken. 3. Build Your First Layer: Arrange one-third of the sliced zucchini and onion in an even layer across the bottom of your prepared baking dish.
Season generously with salt and pepper, then sprinkle with ½ cup of the shredded pepper jack cheese. 4.
Keep Layering: Repeat the process, creating a second layer with another third of the zucchini and onion, another round of seasoning, and another ½ cup of cheese.
Finish with a third and final layer using the remaining zucchini, onion, seasoning, and cheese. 5.
Pour and Perfect: Evenly pour the prepared cream sauce over the entire gratin, making sure it seeps into all the layers. 6.
Bake to Golden Perfection: Place the dish in the preheated oven and bake for 45-50 minutes. You're looking for a beautifully golden-brown top and a sauce that's bubbling happily around the edges. 7.
Rest Before Serving: Carefully remove the gratin from the oven and let it rest for at least 5-10 minutes. This crucial step allows the sauce to set, making it much easier to slice and serve.