Jalapeno Cheddar Burger - Slender Kitchen

Ingredients

• 1.33 lbs 95% lean ground beef (or turkey)
• 1/3 cup red onion, chopped finely
• 1 jalapeno, chopped finely (seeded for less heat)
• 1/2 cup reduced fat shredded cheddar cheese
• 1 tbsp mustard
• 1 tbsp Worcestershire sauce
• 1/2 tsp kosher salt, divided