Make sure all ingredients are at room temp. Blend all cheesecake ingredients until completely smooth in a power blender. Divide the mixture between 7-8 silicone mini muffin molds (this is the mold I use, and I place it inside a regular mini muffin pan for stability. Can also use individual mini silicone muffin liners instead).
Press a blackberry into the top of each cake. Sprinkle with cornflower petals if desired. Freeze for 5 hours or overnight, the pop out of the mold and enjoy. Keep leftovers frozen.