Begin by preparing your coconut fathead dough. Add the coconut flour, grated cheddar, cream cheese, butter, garlic powder, Italian seasoning, half a teaspoon of salt, black pepper, and parmesan to a food processor. Blend to combine creating a chunky crumb.
Crack the eggs into the food processor with the crumb mixture. Blend until well combined and a dough forms. The dough should feel ever so slightly tacky but be easy to mold and shape.
Preheat the oven to 375 degrees Fahrenheit. Cut two large sheets of baking parchment. Scoop the fathead dough out onto one of the sheets of baking paper. Lay the second sheet of paper over the top of the dough. Roll the dough into an even circle roughly 1/4 inch thick. The pizza base should be approximately the size of a dinner plate.
Transfer the pizza base on the sheet of baking paper to a large shallow oven tray. Place in the oven and bake for 10 minutes. The dough should be lightly golden and beginning to firm. Whilst the pizza base is cooking, thinly slice the tomato. After 10 minutes, remove the part cooked pizza base from the oven. Spread the marinara sauce in an even layer over dough base. Scatter over the grated mozzarella and arrange the tomato slices over the cheese.
Transfer the pizza back to the oven. Cook for an additional 12-15 minutes, until the pizza base is golden, the cheese is melted and the tomatoes are soft. Roughly chop the basil and scatter over the pizza do serve.