Cheeseburger Pizza

Ingredients

• 4 ounces 90% lean ground sirloin
• 1/2 cup chopped red onion
• 1/8 teaspoon kosher salt
• 2 tablespoons canola mayonnaise
• 2 tablespoons unsalted ketchup
• 1 (10-ounce) prepared pizza crust (I used Boboli)
• 2 ounces part-skim mozzarella cheese, shredded (about 1/2 cup)
• 1 ounce reduced-fat cheddar cheese, shredded (about 1/4 cup)
• 1 plum tomato, thinly sliced
• 10 dill pickle chips
• 1/4 teaspoon freshly ground black pepper