Preheat oven to 375°F.
Grease 9x13 inch baking dish thoroughly.
Mix ground beef, egg, breadcrumbs in bowl.
Add diced onion, garlic, salt, pepper.
Press meat mixture into baking dish bottom.
Layer sliced potatoes over meat evenly.
Mix sour cream, melted butter, salt together.
Pour mixture over potato layer completely.
Sprinkle cheese and paprika on top.
Cover with foil, bake 45 minutes.
Remove foil, bake 15 minutes more.
Let rest 10 minutes before serving.