Special equipment: 10 foil cupcake liners
For the panna cotta: Place ten foil cupcake liners in a muffin pan. Coat the interior of each with nonstick cooking spray.
Pour the milk in a small bowl and sprinkle with the gelatin; let stand until the mixture has the consistency of granulated sugar, about 1 minute.
Combine the cream and sugar in a medium saucepan set over medium-high heat. Bring to a boil, stirring to dissolve the sugar. Whisk in the milk mixture, then reduce the heat to medium-low and simmer for 5 minutes. Remove the saucepan from the heat, then add in the chocolate chips and vanilla. Whisk until smooth. Pour the liquid through a fine mesh sieve into a large measuring cup. Divide the mixture evenly among the foil liners (they should be filled to the brim). Place the pan on a level surface in the refrigerator until the panna cotta is set and springs back when touched, 2 hours 30 minutes.
For the blueberry sauce: Puree 1/2 cup of the blueberries and 1 tablespoon water in a blender for 1 minute. Scrape out the blueberry puree into a small saucepan. Place the pan over medium heat and add the sugar, stirring until the sugar dissolves and the sauce begins to bubble slightly, 3 to 4 minutes. Remove from the heat, stir in the lemon juice and cool until no longer warm to the touch, 5 to 10 minutes.
Remove the panna cotta from the muffin pan, then gently pull away the sides of the cupcake liners from the panna cotta and invert each onto a plate or shallow bowl. Drizzle each serving with 1 teaspoon of the cooled blueberry sauce and sprinkle 4 to 5 blueberries on top to serve.
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