Preheat the Oven: Preheat the oven to 375°F. Grease a cast-iron skillet or a 9 × 9-inch baking dish.
Prepare the Filling: Add the blueberries, granulated monk fruit sweetener, lemon juice, vanilla extract, and xanthan gum to a medium bowl. Mix thoroughly until the blueberries are evenly coated.
Transfer the Filling: Pour the prepared blueberry mixture into the greased 9 × 9-inch baking dish, or divide it among smaller ramekins.
Make the Crumble: Place the pecans, almond flour, monk fruit syrup, ghee or coconut oil, xanthan gum, lemon juice, and sea salt in a food processor. Pulse until the ingredients form a crumbly topping.
Add the Topping: Distribute the crumble mixture evenly over the blueberry filling, covering the surface.
Bake the Cobbler: Place the dish in the preheated oven and bake for 25–30 minutes, or until the topping is golden brown.
Serve: Serve the cobbler hot, optionally with a scoop of dairy-free ice cream.