Preheat the oven to 425 degrees F. Toss the bacon with the brown sugar in a medium bowl until evenly coated. Arrange the bacon on a baking sheet and bake until light golden around the edges but still very soft, about 7 minutes. Transfer to a plate. Wipe the baking sheet clean, then spray with cooking spray.
Stir together the spinach, cream cheese, Parmesan, mayonnaise, garlic and 1/4 teaspoon pepper in a medium bowl.
Spoon 1 tablespoon of the spinach mixture onto each slice of bread and wrap it with a piece of bacon so that the ends are tucked under the bread (it should look a bit like a belt). Arrange the crostini on the prepared baking sheet and bake until the bacon is dark golden, about 15 minutes. These are best served warm.
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