Preheat oven to 350°F. Lightly grease a 3 quart casserole dish (mine is about 9.5x7.5"and 3" deep).

In a large bowl stir together butter, milk, sugar, eggs, and vanilla until well combined. Gently stir in blueberries with juices.

Add flour, baking powder, baking soda, cinnamon, and salt. Fold gently until just incorporated with no dry clumps remaining, but do not over mix.

Pour into prepared dish. Bake uncovered 45 minutes to 1 hour, or until a toothpick inserted into the center comes out clean (mine took a full hour).

Let cool at least 30 minutes before cutting. Goes great with coffee, hot tea, or a nice cold glass of milk!