In a small saucepan over medium-high heat, stir together the sugar, water, orange juice, cornstarch, and orange zest.
Cook, stirring occasionally, until thickened, about 5 minutes.
Stir in the blueberries and simmer the mixture, stirring occasionally, until the berries have burst, about 5 minutes.
Add the butter and stir until melted.
Remove from heat and spoon or ladle over warm Ooey Gooey Blueberry "French Toast."
YIELD: 3 cups