If you're baking the burgers, preheat the oven to 375 degrees.
In a skillet, heat 1 Tblsp of the oil over medium high heat. Add the onion, and fry, stirring from time to time 5- 7 minutes, or until soft and translucent, then add the garlic and fry for another 30 seconds or until fragrant. Transfer to a bowl.
Heat remaining Tblsp of oil in the same skillet Add the mushrooms and leave the for a minute to brown on one side before stirring in and continuing to fry. Once browned, transfer to the bowl with the onion.
In a food processor, pulse the oats until you have mostly oat flour with whole whole oats remaining for texture. Transfer to the bowl. Put the black beans in the food processor and blend until mostly pureed with some whole beans remaining also for texture. Transfer to the bowl.
Put salsa in a strainer and stir to remove excess tomato sauce, until you have mostly chunks remaining. Measure 1/2 cup of this supper chunky salsa and add it to the bowl with the paprika, salt and pepper. Mix well to incorporate everything.
Form the mixture into 4 - 5 patties, depending on the size of your buns. The mix is a bit wet but should not be unmanageable. I take the ball into my hands flatten it out into the plate, then use a spatual to transfer it to a baking pan or skillet once ready to cook. They may need a bit reshaping once in the pan. If your'e having trouble, you can add a bit more oat flour so they hold together better.
To bake lightly oil a baking pan, transfer the patties to the pan and bake for 20 minutes flipping at 10 minutes. To fry heat a large skillet over medium heat and add a tablespoons of oil. Fry the patties for 4-5 minutes per side until browned.
Once cooked, transfer the patties to a wire rack and let cool for a few minutes. They will firm up as they cool. Serve on buns with your favorite burger toppings.