recipe found on http://www.joythebaker.com/
makes one 10-inch bundt cake (or 12 mini bundt cakes)
2 1/2 cups all-purpose flour
1 1/2 cup sugar
1 teaspoon baking soda
1 teaspoon salt
1 1/3 cup canola oil
1 cup buttermilk
2 egg
1 teaspoon white vinegar
1 teaspoon vanilla extract
2 Tablespoons poppy seeds

Blueberry Glaze
1/4 cup frozen blueberries, thawed but not drained (I wish I would have doubled this)
1 1/2 cup powdered sugar
1/4 teaspoon vanilla extract
1/2 teaspoon fresh lemon juice
2 teaspoons buttermilk (or regular milk is fine too)

Preheat oven to 325 degrees F. Place a rack in the center of the oven. Grease and flour a 10-inch bundt pan and set aside.
In a medium bowl, whisk together the flour, sugar, baking soda and salt. In another medium bowl, whisk together canola oil, buttermilk, egg, vinegar, and vanilla extract. Add the wet ingredients to the dry ingredients all at once. Whisk together until just combined and no lumps remain. Stir in the poppy seeds. Pour the batter into the prepared baking pan and bake for 35-45 minutes, or until a cake tester inserted in the center of the cake comes out clean.
Allow the cake to cook in the pan for 20 minutes. Carefully run a butter knife along the edges of the cake to assure that it is well loosed before inverting the cake onto a wire rack to cool.

To make the blueberry glaze:
Mash the thawed blueberries in a medium sized bowl releasing lots of dark blue juice. Remove most of the blueberry skins from the juice and discard. Add the vanilla extract, buttermilk and lemon. Add the powdered sugar and whisk to combine. If the mixture is too thick, add more milk to reach the desired consistency. If the mixture is too thin, add just a bit more powdered sugar.
Drizzle the glaze over the completely cooled bundt cake and allow to set for 20 minutes before serving.