Pulse lentils in a food processor or blender. It’s okay if lentils are not completely blended; you want the mixture to be slightly course. Empty lentils into a medium bowl and set aside.
In a medium skillet, on medium heat, add 1 tbsp of vegetable oil, garlic, onions, and mushrooms. Sautee until garlic is fragrant. Remove from heat and add to food processor or blender. Also add 1 hamburger bun, Worcestershire sauce, and mustard. Blend until slightly smooth. Mixture may not blend completely, but that’s okay. Do not add any additional liquid; this will make burgers fall apart during the cooking process.
Add mushroom mixture to lentils and stir until all ingredients are thoroughly combined. Add garlic powder and season with salt/pepper to taste. Form into 4 patties.
Heat a medium skillet on medium heat, and add 1 tbsp of vegetable oil. Place patties in skillet and cook for approximately 3-5 minutes on each side; until patties are brown.
Place on hamburger buns and add your favorite toppings/condiments.
Enjoy!