Generously butter a 9-inch pie plate and place berries into the bottom.
In a blender, combine milk, melted butter, eggs and vanilla extract; blend.
In small mixing bowl, combine flour, sugar, nutmeg and salt.
Add flour mixture to blender's wet ingredients; blend until smooth.
Pour over the berries.
Combine 1/4 cup sugar and 1 tsp cinnamon together in separate small dish or sugar shaker (You won't use all of this but it is a good ratio to make cinnamon sugar~ you'll have extra for other recipes!).
Sprinkle top of blueberry popover with 2 tsp of cinnamon sugar mixture.
Bake for 15-20 minutes at 450 degrees then reduce the oven temperature to 350 degrees F and bake another 15-20 minutes.
Cut into wedges and serve warm.
You can top with butter or syrup but I prefer Brummel& Brown's blueberry yogurt spread~ Yummy!