Slow-Cooker French-Dip Sandwiches

Ingredients

• Beef
• 3 pounds beef chuck or round roast, untied
• Salt
• freshly ground black pepper
• 4 cups beef broth
• 2 teaspoons onion powder
• 1 teaspoon garlic powder
• 1 teaspoon dried oregano
• ½ teaspoon dried thyme
• 1 bay leaf
• Sandwiches
• 3 cups baby arugula
• 2 tablespoons olive oil
• 1 tablespoon lemon juice
• 6 tablespoons butter, at room temperature
• 6 long rolls, cut in half lengthwise
• 12 slices provolone cheese