Preheat oven to 350ºF.
In a medium bowl whisk together ¾ cup sugar, flour, baking powder, salt, milk and vanilla.
Pour melted butter into an 8x8-inch pan. Pour batter over melted butter.
In a separate bowl, combine the remaining 1 cup of sugar, the pecans, and toffee bits; sprinkle evenly over the batter.
Slowly pour boiling water over top of the cobbler.
Bake 40 to 45 minutes, until top of the cobbler looks set.
