Preheat the oven to 350 degrees F (175 degrees C).
Crumble the ground beef into a large skillet over medium heat. Season with salt, pepper, cumin, garlic, poultry seasoning, and thyme. Cook, stirring to crumble, until evenly browned. Drain, and transfer to a 9×13 inch baking dish, or large casserole dish.
Arrange 2 layers of sliced potato over the ground beef, seasoning each layer with salt and pepper. Melt butter in the skillet over medium heat, and saute the onions and mushrooms until tender. Spread over the top of the potatoes.
Stir just enough water into the soup to make it pourable, and spoon over the top of the casserole, making sure to spread out evenly. Scatter the cracker crumbs over the top, and sprinkle with paprika. Cover the dish with aluminum foil.
Bake for about 1 hour in the preheated oven, until the potatoes are soft. Remove the aluminum foil, and return to the oven to brown the top, about 10 minutes.