For the Batter:
Cream the butter and sugar in a blender and then add the eggs and continue to beat. When creamy, add the peanut butter, baking soda, salt, and vanilla. Stir all of the dry ingredients together and then add to the batter, stirring gently.
For the Concord Grape Swirl:
Let the chia seeds soak in four tablespoons Concord grape juice. When plump, add them to the Concord grape filling.
Spread the batter in a 9" baking pan (with parchment on the bottom if you like). Then drizzle the Concord grape filling on top and using a knife, swirl into the batter.
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