In a saucepan over medium heat, add 1 c brown sugar, whipping cream, and butter. Heat to boiling, stirring often. Once boiling, continue to stir for 1 min.
Remove from heat. Whisk in powdered sugar and vanilla.
Let stand 5 minutes, stirring occasionally.
Remove side of springform pan. Place cake on serving plate.
Pour praline topping over the top within 1/4" of the edge.
Garnish with candied pecans!