Make the crust. In a large bowl or stand-up mixer, combine the almond flour, tapioca flour or arrowroot starch, garlic powder, onion powder, and sea salt. Stir to blend
While beating on medium speed, incorporate the coconut oil, continuing to beat (and increasing the speed as you need to) until a crumbly dough is formed. Gather the dough into a ball and wrap tightly in plastic wrap. Refrigerate for 15 minutes.
Meanwhile, preheat the oven to 350 degrees. Line a baking sheet with parchment paper. Place the fennel and broccoli or broccolini florets on the baking sheet, coat in oil and season with sea salt and black pepper. Roast for 25 minutes, then remove from the oven and set aside until ready to use.
Grease a 9-inch tart pan with a removable bottom. Remove the ball of dough from the refrigerator. You can either roll the dough out between two sheets of parchment paper until about ¼ inch thick, or use your hands to flatten the dough in the bottom of the pan until even. Discard any excess dough. Pre-bake the crust for 10-12 minutes until slightly golden brown.
In a medium bowl, combine the beaten eggs and dairy-free milk. Whisk until blended. Fold in the roasted fennel and broccoli florets, Miyokos cheese or goat cheese, garlic powder, and more sea salt and black pepper if desired. Whisk until everything is combined.
Pour the egg mixture over the crust in the tart pan. Bake for 30 more minutes. Allow the tart to cool in the pan for at least 30 minutes before removing and slicing. Serve warm or keep loosely covered with tin foil and reheat when ready to enjoy.