Preheat your oven to 425°F and line a baking sheet with parchment paper.
In a bowl, combine the cauliflower rice, almond flour, and egg. Mix thoroughly until the mixture becomes cohesive. Season lightly with salt and pepper if desired.
Transfer the cauliflower mixture onto the prepared baking sheet and pat into a thin, circular crust about 1/4-inch thick.
Bake the crust for 15 minutes or until it begins to set and turn lightly golden.
Meanwhile, season the chicken breast with your preferred herbs and spices. Grill or pan-sear the chicken until fully cooked, then slice into thin strips.
Remove the crust from the oven and spread the basil pesto evenly over the surface.
Layer the cooked chicken slices on top of the pesto, then scatter the cherry tomatoes over the pizza.
Return the pizza to the oven and bake for an additional 5-7 minutes, allowing the toppings to warm and meld together.
Remove from the oven, slice, and enjoy your nutritious, protein-packed Cauliflower Crust Chicken Pesto Pizza.