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Preheat oven to 350 degrees F. Spray 8" x 8" baking dish with cooking spray or baking spray (like Baker's Joy)
In small bowl, combine the brown sugar and cinnamon. Set aside.
In large bowl, combine the flour, salt, and baking powder with a whisk.
In large 4 cup measuring cup, whisk together the sugar, oil, eggs, buttermilk, and vanilla extract.
Pour the wet ingredients into the flour mixture and MIX UNTIL JUST COMBINED. Do not over mix!
Spread 1/2 the batter into the prepared pan, Top with half the blueberries and half the reserved brown sugar/cinnamon mixture. Press down slightly. Spread remaining batter over the first layer and then top with remaining blueberries and brown sugar/cinnamon. With a knife, swirl the batter to swirl the blueberries and cinnamon into the cake.
Sprinkle with sliced almonds, if using, and drizzle with melted butter.
Bake in oven for 40 - 45 minutes, or until toothpick inserted into center comes out clean. All ovens bake differently, so make sure you use the toothpick to ensure the middle is done!
Allow to cool for 15 minutes, dust with powdered sugar (if desired), and enjoy warm!