Step 1 (Sauté Aromatics): In a skillet, heat 1 tbsp olive oil and sauté the sliced leek, chopped onion, and minced garlic over medium heat for 5–7 minutes until soft. Let cool slightly.
Step 2 (Mash Chickpeas): In a large bowl, mash the drained chickpeas with a fork or potato masher until mostly mashed but still retaining a few satisfying chunks for texture.
Step 3 (Mix Everything): Add the chopped spinach, sautéed leek/onion mix, breadcrumbs, aquafaba, lemon juice, spices, and optional nutritional yeast/parsley. Mix well until a cohesive dough forms.
Step 4 (Rest Mixture): Let the mixture rest for 10–15 minutes so the breadcrumbs absorb excess moisture and firm up the dough.
Step 5 (Shape Patties): Form the mixture into 6–8 uniform patties, pressing firmly so they hold together.
Step 6 (Bake & Crisp): Preheat oven to 400°F (200°C). Place patties on a parchment-lined baking sheet, brush lightly with oil (optional), and bake for 20–25 minutes, flipping halfway through, until golden and crispy!