Pastrami Meatballs

Name: Pastrami Meatballs
Ingredients: Cooking spray, for the baking sheets; Olive oil, for cooking; 1 small onion, finely chopped; 4 cloves garlic, minced; 2 large eggs, lightly beaten; 1 cup breadcrumbs; 1/4 cup chopped fresh parsley; 2 teaspoons mustard powder; 1 tablespoon brown sugar; 2 teaspoons kosher salt; 1/2 teaspoon crushed red pepper; 1/4 teaspoon ground cinnamon; 1/4 teaspoon ground coriander; 1/4 teaspoon liquid smoke; 1/8 teaspoon ground allspice; 1/8 teaspoon ground cloves; 1/8 teaspoon ground ginger; Freshly ground black pepper; 2 pounds ground beef (I like to use 90/10, but any combination will do here); 1 loaf sliced rye bread, cut into about 2-inch squares; Brown deli mustard, for serving; Pickle chips, for serving