Lazy Shoulder Sliders

- 2 pounds chuck shoulder roast, cut into 2-inch cubes

- 1 1/2 teaspoons kosher salt

- 1 teaspoon black pepper

- 2 teaspoons canola oil

- 1 onion, diced

- 2 cloves garlic, minced

- 3 cups low-sodium beef broth

- 4 sprigs fresh thyme

- 2 packages pull apart rolls (look for Hawaiian rolls, 12 per pack)

- 12 slices provolone cheese

- 2 tablespoons butter, melted

- Coarse salt for topping