Preheat your oven to 425°F (220°C).
Begin by making the crust: In a large bowl, whisk together almond flour, coconut flour, xanthan gum, baking powder, and salt.
Add the egg and olive oil into the dry ingredients and mix until a dough forms.
Place the dough between two pieces of parchment paper and roll it out to your desired thickness for the pizza base.
Remove the top parchment paper and transfer the crust (on the bottom parchment paper) to a baking sheet or pizza stone.
Pre-bake the crust for 8-10 minutes or until it's lightly golden and firm to the touch.
While the crust is baking, prepare the cream cheese spread by mixing cream cheese, lemon zest, lemon juice, salt, and pepper in a bowl until smooth and spreadable.
Once the crust is pre-baked, spread the cream cheese mixture evenly over the surface.
Top with shredded mozzarella cheese, followed by slices of smoked salmon and red onion.
Sprinkle capers and fresh dill over the toppings.
Return the pizza to the oven and bake for an additional 5-7 minutes, or until the cheese is melted and bubbly.
Slice and serve immediately, garnishing with extra dill if desired.