Step 1

Spray 8 (4-ounce) ramekins with nonstick spray.

Step 2

Pour 3 tablespoons of milk into small bowl and sprinkle the gelatin over top; let it stand 10 minutes.

Step 3

Meanwhile, heat remaining 1 1/4 cup milk and 5 tablespoons sugar in small saucepan over medium heat. Add the gelatin mixture and stir until sugar and gelatin are completely dissolved (do not boil).

Step 4

Remove from heat and let cool slightly. Whisk in yogurt and vanilla until smooth.

Step 5

Divide mixture, about 1/3 cup each equally among prepared ramekins, cover with plastic wrap, and chill until firm, at least 6 hours or overnight.

Step 6

About 30 minutes before serving, combine berries with the remaining 1 tablespoon of sugar in a medium bowl; stir occasionally with rubber spatula until juicy, at least 10 minutes.

Step 7

Unmold each panna cotta onto small plate; top each with 1/2 cup berries.

Step 8

Garnish with fresh mint leaves if desired.