In the bowl of a stand mixer fitted with the paddle attachment, combine 100% brownie mix and 25% water. Mix according to manufacturer's instructions. Reserve.
In the bowl of a stand mixer fitted with the whip attachment, mix together 133.3% water and 100% meringue mix, whip to stiff peaks. Fold with reserved brownie mixture. Spoon batter into tart shells and bake in a 350°F oven until just set all the way across (8-12 minutes).
Tart is best served warm or reheated in the oven to warm for a few minutes.
Meringue, Tartlette, Chocolate, Tart