I give my students a copy of the state map to locate the major rivers and cities. Students are busy using markers to highlight and name the rivers, cities, and bordering states....while they wait their turn to decorate a portion of the cookie cakes.
I usually buy the store brand roll of chocolate chip cookie dough and the cheapest cookie trays along with tubes of blue and yellow frosting. I have two classes of students for Indiana history ~ about 55 students. So I make 6 Indiana shaped cookie cakes the night before.
I roll out the cookie dough right onto the disposable cookie trays using a little bit of flour as I roll. I then free-hand the shape of the state before baking. I usually check half-way through the baking process to reshape (using a spoon) the indentations of our state. This can also be done right as the cookie is removed from the oven...while it's still hot.
I'm sure this could be recreated for most states. It makes for a memorable experience and something fun to do before Christmas.