In a large sauté pan set over medium, heat 2 tablespoons of olive oil. Add onion and cook until translucent, about 2-3 minutes. Add garlic and cook until fragrant, about 1 minute. Add mushrooms and continue to cook for 4 minutes. Remove from heat and let cool slightly.
Transfer pan contents to a food processor. Add rice and chickpeas, cover, and pulse until mixture resembles ground beef. Transfer to a large bowl.
Add shredded zucchini, breadcrumbs, egg, smoked paprika, and salt and pepper, to taste. Stir until all ingredients are moistened. Let mixture rest for 5 minutes.
Heat the broiler and position the oven rack 3 inches from the heat. Line a large baking sheet with foil. Lightly grease the foil with olive oil.
With wet hands, shape mixture into patties,about 4 inches in diameter and ¾-inch thick. Place on foil-lined baking sheet.Broil for 15-16 minutes until browned and crispy, flipping halfway through.
Serving suggestion: Top with mashed avocado, lettuce, roasted red pepper strips, redonions, and crumbled goat cheese or dairy-free cheese alternative of choice.
Notes
To make this burger vegan: Reserve 3 tablespoons of the aquafaba (chickpea liquid) when draining the chickpeas. Whisk together 1 tablespoon of flaxseed meal with the reserved liquid and let rest until fully absorbed and thickened, about 5 minutes. Use instead of the egg in the recipe.