Preheat the oven to 400º.
Wash the baked potato and bake until it is easily pierced with a fork. About an hour.
While the potato is cooking, drain and rinse the kidney beans and add them to a small saucepot. Cover the beans with water. Bring the beans to a low simmer and cook for 20 minutes. Drain and set them aside.
Add the flaxseed meal to small bowl. Add the water and mix thoroughly. Set aside.
Heat the safflower oil in a medium-sized skillet. When shimmering, add the onion and reduce the heat to medium-low. Add the garlic salt and slow cook the onions until they’re golden brown. About 12-15 minutes.
Add the diced celery and tomato paste. Increase the heat to medium and sauté the onions, celery and tomato paste until the tomato paste is dark red. Remove from heat.
Roughly chop the baked potato with the skin intact and add it to a food processor. Pulse until the potato becomes creamy and the skin is reduced to small pieces.
Add the drained kidney beans, flaxseed meal, cooked onions and celery, pumpkin seeds and cooked quinoa. Pulse until well combined and no large pieces remain.
Chill the mixture for 1 hour. This will make it easier to make into patties.
Using your hands, form the mixture into burger-sized patties. Add 1 tbsp safflower oil to a medium sized skillet and add 4 patties. Press the patties with a spatula and cover with a lid. Cook on one side for 2-3 minutes, until the burger is browned then flip and cook the other side for 2-3 additional minutes.
Serve immediately with burger buns (or bunless) with fresh arugula, sliced tomatoes, sliced avocado and ketchup and mustard.