Jalapeño-Onion Smash Burgers Recipe

Ingredients

• 3 tbsp mayonnaise
• 1 1/2 tbsp ketchup
• 1 tsp Worcestershire sauce
• 1/2 tsp black pepper
• 1/4 tsp garlic powder
• 1/4 tsp kosher salt
• 1 1/2 lbs high-quality 80% lean ground beef
• 1 tsp canola oil
• 1 large yellow onion, thinly sliced
• 1 large jalapeño chile, thinly sliced
• 1 1/4 tsp kosher salt, divided
• 3/4 tsp black pepper, divided
• 4 slices American cheese
• 4 hamburger buns, split and toasted