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Bring sheet of frozen pastry out of freezer to come to room temperature. Follow instructions on the box but should take about 30 min.
If not already done, slice nectarine into thin slices about ¼-⅛" wide
Mix together softened mascarpone, 2 tbsp powdered sugar, vanilla, cinnamon and cardamom
Whisk together egg and water in a small bowl for egg wash.
Preheat oven to 400°F
When pastry is thawed, unfold and cut into 6 pieces. Score into each pastry a rectangle about ½ inch from the edge, creating a frame.
Spoon about 1 tbsp of the spiced mascarpone mix into the center of each piece of pastry and spread to the edge of where you scored.
Layer 4-6 pieces of nectarine over the mascarpone.
Brush the edges of each danish with the egg wash.
Bake on the center rack for about 20 minutes, edges of the danish will be golden brown.
Transfer to a wire rack and let cool.
While danishes are cooling, whisk together milk and powdered sugar for glaze.
Drizzle over danishes while warm, enjoy!
Danishes are best eaten same day.