Best French Dip Squares Recipe - How to Make French Dip Squares

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