Prep your flax egg: Combine 1 tbsp flaxseed meal in a small bowl with 2.5 tbsp water. Set aside to thicken.
Pulse the base: Add drained chickpeas and lentils, chopped onion, garlic, flax egg, paprika, cumin, nutritional yeast, salt, pepper, and herbs in a food processor. Pulse until well-combined but still textured—don’t overdo it!
Add oats and oat flour: Add 1/2 cup rolled oats and 3/4 cup oat flour. Pulse again just until it starts to come together. If it's still too sticky, sprinkle in more oat flour, 1 tablespoon at a time.
Form your patties: Divide the mixture into 4–6 portions and shape into patties using damp hands to prevent sticking.
Cook: Skillet: Preheat a non-stick pan over medium heat. Cook patties for 4–5 minutes per side until golden brown. Air Fryer: Cook at 375°F (190°C) for 10–12 minutes, flipping halfway. Oven: Bake at 400°F (200°C) for 25–30 minutes, flipping halfway, until golden and firm.
Serve and enjoy: Stack them in a whole-grain bun or lettuce wrap and top with avocado, tomato, mustard, or your favorite WFPB sauce.