01 - Line a 12-cup muffin tin with paper liners or prepare silicone molds. Set aside.
02 - In a mixing bowl, combine the graham cracker crumbs, granulated sugar, and melted butter until the mixture resembles wet sand. Press approximately 1 tablespoon of the crumb mixture firmly into the bottom of each liner. Place the muffin tin in the refrigerator to chill while preparing the filling.
03 - In a large bowl, beat the softened cream cheese with an electric mixer until completely smooth and free of lumps. 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 using a whisk or electric mixer. Gently fold the whipped cream into the cream cheese mixture in two additions, being careful not to deflate the cream, until the filling is smooth and fluffy.
05 - Spoon or pipe the filling evenly over the chilled crusts, dividing it among all 12 cups. Smooth the tops with a small spatula.
06 - Cover the muffin tin tightly and refrigerate for at least 4 hours, or until the cheesecakes are firm and fully set.
07 - In a small saucepan, combine the fresh blackberries, granulated sugar, and lemon juice. Cook over medium heat, stirring frequently and gently mashing the berries with a spoon, 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.