Begin by caramelizing the onion. Heat a medium saucepan on medium-high. Add oil and onion, then reduce heat to medium. Saute, stirring occasionally, until onion is soft and light golden brown, about 15-20 minutes. Season with salt, remove from heat, and set aside.
While the onion is cooking, prepare the avocado crema. In a food processor, combine avocado, sour cream, lime juice and a pinch of salt. Process until smooth, then set aside.
To make the burgers, sauté Power Blend for 2 minutes until softened. Add minced garlic and stir for 1 more minute, then remove from heat.
In a medium mixing bowl, mash the black beans with a potato masher or food mill. Add sautéed Power Blend, egg, bread crumbs, sriracha, salt and pepper. Stir to combine, then form mixture into 6 patties.
Cook patties in a non-stick skillet over medium-high heat, about 5-6 minutes per side, until nicely browned.
Place 1 burger patty on top of 1 green leaf lettuce. Top with a couple spoonful’s of the caramelized onion and a dollop of avocado crema. Wrap burger leaf around the patty, close with a toothpick, and serve.