Hamburger and Grape Tomato Pizza

Name: Hamburger and Grape-Tomato Pizza
Ingredients: 2 teaspoons vegetable oil, such as safflower; All-purpose flour, for work surface; 1 pound frozen pizza dough, thawed; 3/4 cup store-bought marinara sauce; 1 cup grated provolone cheese (4 ounces); 1 cup grape or cherry tomatoes, halved; 1/2 medium red onion, thinly sliced (optional); 1/4 pound ground beef chuck; Coarse salt and ground pepper