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The good thing about baking brownies or Cowboy Coffeecake (Better Homes and Gardens pg 78) is that it goes together quickly (except for going to the grocery store mid-prep for shortening) and with minimal effort.
The bad thing about pans of baked goods is that you can't eat them before the party. Nobody knows how many cookies you baked versus how many you brought, but a pan of coffeecake with a corner missing is pretty darn obvious.

It's just going to sit on my counter and tempt me until the party.