You can use any of your favorite pizza toppings on these crackers. Try diced deli ham, chopped bell pepper, or pineapple chunks.
Heat broiler (or toaster oven). Place crackers on a broilerproof (or toaster-oven) baking sheet.
Dividing evenly, top crackers with marinara sauce and mozzarella cheese. Top half of the crackers with chopped broccoli.
Broil until cheese has melted, 2 to 3 minutes.