I've made a dessert pizza using a foccacia bread recipe but leaving out any savory seasonings like garlic or rosemary and adding a small amount of sugar. Then I sprinkle cinnamon and sugar over the top and bake it. You can put it in a pizza pan so it is round, or form it into a rectangle. I usually use the rectangle and cut it in strips to serve. I don't put any toppings on it to bake, other than the cinnamon and sugar.
After it is baked, I drizzle it with a thin vanilla icing. But you could also add any sort of cooked fruit pie filling, like apple or cherry. Just make sure it is gluten free or make your own, using corn starch to thicken. If you prefer fresh fruit, then spread a thin layer of icing on the pizza after it has baked, stick the fruit down and add another drizzle of icing or some thinned down jam/jelly.