In medium saucepan, combine the ¾ cup of old-fashioned oats, cracked wheat, cinnamon, salt, and milk. Slowly bring to a boil; immediately reduce to a simmer and cover. Cook approximately 8 to 10 minutes.
Meanwhile, prepare the topping. Preheat oven to 325°. In a small saucepan, melt the butter and add brown sugar, vanilla, and ¼ teaspoon of salt. Cook only until the sugar dissolves.
Put 2 cups of old-fashioned oats into a bowl and pour the hot sugar mixture over. Mix well.
Spread onto an oiled cookie sheet. Bake 10 minutes or until golden brown, stirring once.
Sprinkle ½ cup of topping mixture over each serving of hot porridge. Sprinkle with currants if desired.