Ingredients
- Cooking spray
- 2 (8-oz.) tubes refrigerated crescent rolls
- 4 tbsp. butter, divided
- 2 medium onions, thinly sliced
- 4 sprigs fresh thyme, divided
- Kosher salt
- Freshly ground black pepper
- 1/4 c. whole-grain mustard
- 1/2 lb. deli roast beef, patted dry
- 9 slices provolone
- 1 tbsp. freshly chopped parsley
- 1 clove garlic, minced
- 1 c. low-sodium beef broth
- 1 tbsp. Worcestershire sauce
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