Cheese Tarts with Bacon and Fingerling Potatoes

Name: Cheese Tarts with Bacon and Fingerling Potatoes
Ingredients: 11 ounces fingerling or baby Yukon Gold potatoes (about 6 potatoes), scrubbed; 1 3/4 teaspoons kosher salt, divided; 6 bacon slices (about 4 ounces); 2 tablespoons extra-virgin olive oil; 1 large yellow onion, thinly sliced (about 2 1/2 cups); 1/4 teaspoon black pepper, plus more for garnish; 1 (14-ounce) package frozen all-butter puff pastry, thawed; 8 ounces soft, washed-rind cow-milk cheese, such as Reblochon, rind removed, thinly sliced, and torn; Fresh thyme leaves, for garnish