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Step 1:
Cream together the butter , sugars, eggs and vanilla. Add the dry ingredients and combine.
Step 2:
Add sour cream and egg nog to mixture and mix until you have a nice cake batter.
Step 3:
Pour the cake batter into a prepared 9x9 baking dish and spread into an even layer.
Step 4:
Combine the crumb mixture ingredients and sprinkle liberally over the top of the cake.
Step 5:
Bake in a 350 degree oven for 40-45 minutes or until a toothpick comes out with only a few crumbs. T