Peel the potatoes and slice them into thin rounds. Cook them in salted water for about 10-12 minutes, until partially cooked but still firm. Drain well.
In a skillet, brown the ground meat in a little oil over medium heat. Add the finely chopped onion, garlic, tomatoes, and bell pepper. Season with salt and pepper and cook until the vegetables are tender.
Whisk the eggs together, then mix in the sour cream and grated cheese. This will be the sauce for the top of the casserole.
Grease a baking dish with a little oil. Layer the bottom with a layer of cooked potatoes, followed by a layer of the meat mixture, another layer of potatoes, and finally, the remaining meat mixture. Pour the egg and sour cream mixture over the top.
Bake in a preheated oven at 350°F (180°C) for about 30 minutes, or until the top is golden brown and bubbly.
Let the casserole cool slightly before slicing and serving.
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