Preheat the oven to 350°F (175°C).
Unroll the phyllo dough and cover it with a damp cloth to prevent it from drying out.
Take one sheet of phyllo dough, brush it with melted butter, and layer another sheet on top. Repeat this process until you have 5 layers.
Cut the layered phyllo into squares (about 4x4 inches) and gently press each square into a muffin tin, forming cups.
Repeat with the remaining phyllo dough until all cups are formed.
Bake the phyllo cups in the preheated oven for 10-12 minutes or until golden brown. Remove from the oven and let cool.
In a mixing bowl, beat the softened cream cheese until smooth. Add the powdered sugar and vanilla extract, mixing until well combined.
Fold in the sour cream until the mixture is creamy and smooth.
Spoon the cheesecake filling into each cooled phyllo cup.
Top each cup with fresh berries and garnish with mint leaves if desired.