In medium-sized pot bring 2 cups of water, ¾ cup lentils, and ⅛ tsp salt to a boil. Cover with a tilted lid and reduce heat to a simmer, cooking for 20-25 minutes (depending on type of lentils) until tender. Strain any excess water.
Meanwhile, heat a large skillet on medium heat with 2 tsp avocado oil. Once hot, add onions and jalapeño and cook until softened, about 5-7 minutes. Stir in garlic and 1 cup green peas and cook 1-2 more minutes, until fragrant. Turn off heat and set aside to cool a bit.
In a large bowl, place 3 Tbsp flaxseed, ¼ cup almond or peanut butter, 3 Tbsp tamari, fresh cilantro, 1 Tbsp cumin, and 1 Tbsp chili powder. Add cooked lentils and onion/pea mixture once those finish cooking. Start with ½ cup bread crumbs and mix everything together.
Form patties with your hands, adding more breadcrumbs if needed (I usually end up using ¾-1). Patties should be easy to form and slightly tacky but not too sticky. Place patties on a parchment-lined baking sheet. If you have the time, refrigerate for 1 hour, but it's not required.
Once ready to cook, preheat oven to 400°F.
Brush patties lightly with olive oil before cooking. Bake for 20-25 minutes, until both sides are lightly browned, carefully flipping after 15 minutes. Once veggie burgers finish cooking, allow to rest for at least 5 minutes before handling in order to firm up.
Assemble veggie burgers on a lightly toasted buns with all your favorite burger toppings and condiments. Enjoy!