Flavorful Jalapeño Onion Beef Patties

Ingredients

• 1/4 teaspoon garlic powder
• 3 tablespoons mayonnaise
• 1/4 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 1 1/2 tablespoons ketchup
• 1 teaspoon Worcestershire sauce
• 1 teaspoon canola oil
• 4 hamburger buns, halved and toasted
• 1 1/4 teaspoons kosher salt, split
• 1 large yellow onion, sliced thin (2 cups)
• 4 slices American cheese
• 1 large jalapeño, thinly sliced (1/2 cup)
• 3/4 teaspoon black pepper, split
• 1 1/2 pounds ground beef (80% lean, high quality)