01 - Line a 12-cup muffin tin with paper liners or use silicone molds.
02 - In a bowl, combine the graham cracker crumbs, granulated sugar, and melted butter until evenly moistened. Press approximately 1 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 with an electric mixer until completely smooth. Add the powdered sugar, vanilla extract, lemon zest, and ground lavender, then mix until fully incorporated and no lumps remain.
04 - In a separate bowl, whip the heavy cream to stiff peaks. Gently fold the whipped cream into the cream cheese mixture in two additions, maintaining as much volume as possible, until light and fluffy.
05 - Spoon or pipe the filling evenly over the chilled crusts, dividing it among all 12 cups. Smooth the tops with a spatula.
06 - Cover the muffin tin tightly and refrigerate for at least 4 hours, or until the filling is firm and set.
07 - Combine the fresh blackberries, granulated sugar, and lemon juice in a small saucepan. Cook over medium heat, stirring occasionally 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, then serve immediately.