In a bowl, combine the first 6 ingredients. Mix in the milk, 1/4 cup melted butter, egg, vanilla, and almond extract. Mix together for 2 minutes or until well blended.
Prepare a 9x13 baking dish with cooking spray. Pour the mixture into dish. Sprinkle with blueberries.
In a small bowl, combine 1/2 cup sugar and 1/2 cup flour; add 1/4 cup melted butter. Toss with a fork until crumbly; sprinkle over blueberries. Add the toasted almonds (optional).
Bake for 35-40 minutes or until lightly browned. Allow to cool 5-10 minutes before serving!