For the dough ~
3-1/2 cups all-purpose flour, plus more for dusting
3 large eggs
2 tablespoons sour cream
3/4 to 1 cup water

For the filling ~
1-1/2 lbs baking potatoes, peeled and cut into 1-inch slices
2 tablespoons unsalted butter
1 tablespoon extra-virgin olive oil
1 small sweet onion, chopped
1 clove garlic, minced
1/4 teaspoon dried thyme
3/4 to 1 cup grated dry farmer's cheese
Kosher salt and freshly ground pepper to taste