Preheat oven to 425 degrees. Drizzle a large oven-safe skillet or baking dish with extra virgin olive oil (2 teaspoons).
In a large bowl combine ground beef (1 pound), minced garlic (3 teaspoons), old fashioned oats (4 tablespoons), fresh oregano (2 tablespoons), fresh baby dill (3 tablespoons), salt, black pepper, red onion (1/2 medium), and zucchini (1/4 cup), and mix well. Shape into 1 1/2 inch balls and place in prepared skillet or baking dish.
Bake for 20 minutes or until browned and cooked through the center. Serve meatballs gyro-style wrapped in a pita with cucumbers, tomatoes, lettuce, and tzatziki sauce, or serve meatballs alone for a grab-n-go meal.