Step 1

Mix flour, sugar, baking powder, baking soda and salt in medium bowl

Step 2

In a large bowl add buttermilk, butter, eggs, and vanilla and whisk together

Step 3

Slowly add dry mixture to wet ingredients and stir until no lumps remain

Step 4

Carefully fold in blueberries, careful not to stir very much if you are using frozen or the color will bleed into your batter

Step 5

Spray crock very well with nonstick spray

Step 6

Poor batter into crock and cover

Step 7

Cook on high for 2 hours until edges are slightly browned and the center is fully cooked through

Step 8

Let cool uncovered for 10 minutes then slice and serve