Preheat the oven to 300 degrees F. Line a baking sheet with aluminum foil.
In a large skillet, cook the bacon over medium heat until crispy, 5 to 7 minutes. Remove and drain on paper towels. When cool enough to handle, chop the bacon into small pieces. Set aside.
Meanwhile, pour off most of the bacon fat from the hot skillet and add the butter. Add the sugar, five-spice powder, cayenne and salt and stir until the sugar dissolves and everything is combined. Add the almonds and stir to coat.
Spread the nuts on the prepared baking sheet and bake until golden brown, about 30 minutes. Stir in the bacon and serve warm or at room temperature.