Shepherds Pie Baked Potatoes

Name: Shepherd's Pie Baked Potatoes
Ingredients: 4 russet potatoes (about 8 ounces each); 5 tablespoons unsalted butter; 1/2 onion, chopped; 3 cloves garlic, sliced; 1 tablespoon chopped fresh thyme; Kosher salt; 12 ounces ground beef; Freshly ground pepper; 1 cup low-sodium beef broth; 3 tablespoons ketchup; 2 teaspoons Worcestershire sauce; 1 cup frozen peas and carrots, thawed; 1 cup shredded colby jack cheese (about 4 ounces)