Best Beer Cheese Pretzel Sliders - How to Make Beer Cheese Pretzel Sliders

Ingredients

• 1 1/2 lb. ground beef
• 1/2 c. plain breadcrumbs
• 1 large egg
• 1 tbsp. Worcestershire sauce
• 1 tbsp. yellow mustard
• 2 cloves garlic, minced
• kosher salt
• Freshly ground black pepper
• 3 tbsp. flour
• 3 tbsp. butter
• 1 tbsp. Dijon mustard
• 3/4 c. beer
• 1 c. milk
• 2 c. shredded Cheddar
• 1 c. shredded mozzarella
• Pinch cayenne
• 2 tbsp. chopped chives, plus more for serving
• 12 pretzel buns