
Add the dry ingredients to the wet ingredients and fold together (batter should be somewhat thick, sticky and doughy). Fold in the apple.
Scoop into the prepared pan and spread to the edges, bake for ~55 minutes, or until edges have browned and center is firm. Let cool in pan for a few minutes, then transfer to a wire cooling rack.
In a large microwave-safe bowl, stir together the sucanat and applesauce. Microwave at 20-second intervals, stirring between each one, until sucanat has completely melted and mixture is thin and runny.
Whisk in the erythritol, scoop by scoop, until frosting is thick. Spread onto the cooled blondies.
Top blondies with the caramel just before serving.