Mix the minced meat with the finely chopped onions, breadcrumbs, eggs, and sour cream. Season with salt and pepper. Refrigerate the mixture until ready to assemble.
Lay a slice of ham flat. Place a slice of cheese on top. Spread a portion of the meat mixture onto the cheese. Roll tightly and place seam-side down in a baking dish. Repeat with remaining ham, cheese, and meat mixture to make 12 roulades.
In a bowl, mix the cream, crème fraîche, and chili sauce. Season with salt, pepper, and chili powder. Pour the sauce over the roulades.
Bake at 180°C (356°F) for roughly 1 hour, until the internal temperature reaches 71°C (160°F).