I found this in a family fun magazine. It would be a wonderful tree to make for Christmas breakfast with kids. make it ahead and on Yule or Christmas morning the kids can grab a glass of milk and either eat like a rice crispy bar or break into a bowl and serve milk over it.
Spray a 9x13 pan with cooking spray. Melt butter over low heat adding marshmallow and stirring until melted.
add cereal and mix well
Press into the pan and cool 1 hour. using a star shape in different sizes (I would just make 5 temp-lets and cut them out) so you will have nine layers and a baby star on top.
Then spread some (it says half) frosting on a plate to look like snow and frost each star with frosting and starting from the ;largest place them on top of each other making a half turn so all the points come out in different places. Then add the last star on top on it's side.
It will look nice like that or decorate with small pieces of candles and sprinkle with clear editable crystals.
You could use the cocoa pebbles and make the frosting green and add tiny white sprinkles or editable clear crystals as snow on top