01 - Line a 12-cup muffin tin with paper liners or use silicone molds.
02 - In a bowl, mix the graham cracker crumbs, sugar, and melted butter until evenly combined. Press approximately one tablespoon of the mixture firmly into the bottom of each liner. Refrigerate while preparing the filling.
03 - In a large bowl, beat the cream cheese until smooth using an electric mixer. Add the powdered sugar, vanilla extract, lemon zest, and ground lavender, then mix until fully incorporated and creamy.
04 - In a separate chilled bowl, whip the heavy cream to stiff peaks. Gently fold the whipped cream into the cream cheese mixture in two additions, maintaining as much air as possible, until smooth and fluffy.
05 - Spoon or pipe the cheesecake filling evenly over the prepared crusts. Smooth the tops with a small spatula or the back of a spoon.
06 - Cover the muffin tin with plastic wrap and refrigerate for at least 4 hours, or until the filling is firmly set.
07 - Combine the blackberries, sugar, and lemon juice in a small saucepan. Cook over medium heat, stirring frequently and gently mashing the berries, until the mixture becomes syrupy, about 5 minutes. Remove from heat and let cool completely.
08 - Spoon the cooled blackberry sauce over each mini cheesecake. Garnish with a sprig of fresh lavender or a whole blackberry, if desired. Serve chilled.