Wash and peel the beets, then grate them using a coarse grater. Finely chop the onion and crush the garlic.
Heat the olive oil in a skillet over medium heat. Sauté the onion and garlic until softened. Add the grated beets and cook until tender, about 10 minutes.
Meanwhile, in a bowl, combine the cooked beans with the sour cream, eggs, and spices. Season with salt and pepper to taste.
Place the beet mixture in the bottom of a baking dish. Pour the bean mixture over the beets. Sprinkle the top with grated cheese.
Bake in a preheated oven at 350°F (180°C) for 25-30 minutes, or until the cheese is golden brown and bubbly.
Let the casserole rest for a few minutes before slicing and serving. Garnish with fresh parsley, if desired.
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