In a bowl, combine the first 6 ingredients. Add the milk, butter, egg and vanilla. Beat for 2 minutes or until well blended.
Pour into a greased 13x9-in. baking dish. Sprinkle with blueberries. In a bowl, combine sugar and flour; add butter. Toss with a fork until crumbly; sprinkle over blueberries. Bake at 350° for 40 minutes or until lightly browned.