Preheat the oven to 450 degrees F. If using a pizza stone, place it in the oven to preheat.
Heat a large saute pan over medium heat. Add the pancetta and cook until crisp, stirring often, about 8-10 minutes. Transfer the pancetta to a paper towel-lined plate, and drain all but a tablespoon or two of grease from the pan.
Return the pan to the heat, and sauté the garlic in the remaining grease for 30 seconds or until just fragrant. Add the kale and cook until just wilted. Sprinkle with salt and pepper, and remove from the heat.
If not using a pre-cooked crust, form two pizza rounds by rolling out the dough on a lightly floured surface until they are 10 to 12-inches in diameter and about a 1/2 inch thick. You may wish to roll out the second one while the first is baking. Remember to place on the peel or sheet pan before you add toppings. (You may also follow the directions for the gluten-free crust; see linked recipe, above.) Once in the desired shape, place on parchment-lined baking sheets. If using a pizza stone, place the pizzas, one at a time, on a pizza peel–or on a cool, upside-down sheet pan–dusted with cornmeal. Use enough cornmeal so that dough does not stick to the surface.
Drizzle the pizza dough or the prepared crusts with the olive oil. Scatter the mozzarella cheese evenly over the top of each pizza, followed by the sautéed kale and crisp pancetta.
Transfer the pizza to the oven. Bake for 12-14 minutes or until crust is golden brown and cheese is melted and bubbly. If using precooked crusts, bake for approximately 5 minutes or until the cheese is melted.
Once one pizza is out of the oven, proceed with the second pizza. Cut the pizzas into quarters or eighths. Transfer to plates and serve warm.