Place the Brussels sprouts and a small amount of water in a saucepan; cover and cook until tender. Meanwhile, in a skillet, saute onions in 2 tablespoons butter until golden brown. Remove from the heat; stir in the sour cream, cottage cheese, garlic, paprika, salt, and caraway seeds. Drain sprouts; add to onion mixture with noodles. Spread into a greased shallow 2-quart baking dish. Melt remaining butter and toss with bread crumbs. Sprinkle over casserole. Bake, uncovered, at 375 degrees, for 20 to 25 minutes or until golden brown.