01 - Line a 12-cup muffin tin with paper liners or arrange silicone molds on a flat baking sheet.
02 - Combine graham cracker crumbs, sugar, and melted butter in a mixing bowl, stirring until the mixture resembles wet sand. Press approximately 1 tablespoon of the mixture firmly into the bottom of each liner. Place the tin in the refrigerator to chill while preparing the filling.
03 - Beat the softened cream cheese in a large bowl until completely smooth and free of lumps. Add powdered sugar, vanilla extract, lemon zest, and ground lavender, then mix until fully incorporated and creamy.
04 - In a separate bowl, whip the heavy cream to stiff peaks using an electric mixer or whisk. Gently fold the whipped cream into the cream cheese mixture in two additions, maintaining as much air as possible until the filling is 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 small spatula or the back of a spoon.
06 - Cover the muffin tin tightly and refrigerate for at least 4 hours, or until the cheesecakes are firm and fully set.
07 - Combine fresh blackberries, sugar, and lemon juice in a small saucepan. Cook over medium heat, stirring frequently and gently mashing the berries with a spoon, until the mixture thickens into a syrupy consistency, 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.