Press the pizza dough into a greased 9- to 10-inch cast-iron skillet and let rise until doubled in size, 20 to 30 minutes.
Preheat the oven to 400 degrees . Brush the dough with the olive oil. Using a food processor, puree the cottage cheese, sour cream and 1/8 teaspoon pepper. Spread over the crust, leaving a 1/2-inch border. Arrange the ham on top, then sprinkle with the gruyere and onion. Bake until golden-brown, 25 to 30 minutes. Sprinkle with the thyme and let cool for 10 minutes before slicing.