Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper or a silicone baking mat.
In a large microwave-safe bowl, combine the shredded mozzarella and cream cheese. Microwave for 1 minute, stir, and microwave for another 30 seconds until fully melted.
To the melted cheese, add the almond flour, coconut flour, baking powder, and salt. Mix well to combine.
Add the egg to the cheese and flour mixture. Mix until a dough forms. If the dough becomes too stiff, microwave for an additional 15-20 seconds.
Place the dough on the lined baking sheet and press out into a circle, about 1/4 inch thick. Poke a few holes in the crust with a fork to prevent bubbling.
Bake the crust for 8-10 minutes or until lightly golden.
While the crust is baking, brown the ground beef in a skillet over medium heat. Drain excess fat, then stir in the taco seasoning and chili flakes. Cook for an additional 2 minutes.
Remove the crust from the oven. Spread the low carb pizza sauce over the crust, leaving a small border around the edges.
Sprinkle the cooked spicy ground beef evenly over the sauce, then top with shredded cheddar cheese, black olives, and red onion.
Return the pizza to the oven and bake for an additional 5-7 minutes, or until the cheese is melted and bubbly.
Take the pizza out of the oven and let it cool for a couple of minutes. Top with diced tomatoes, fresh cilantro, and avocado slices before serving.