Preheat oven to 425 degrees and line a baking sheet with parchment paper.
Stir together strawberries and powdered sugar. Using the back of the spoon, gently mash a few berries to make more "juice". Leave the majority of the berries in whole slices. Set aside.
In a large mixing bowl, stir together flour, sugar, baking powder and salt. Using a pastry blender, cut in butter until mixture resembles coarse crumbs.
In a measuring cup, measure milk and add egg; whisk to combine. Add milk mixture to dry ingredients all at once. Stir just until moistened. Do not over mix.
On a lightly floured surface, dump dough and knead with floured hands for 10-12 strokes. Pat dough to 3/4-inch thickness. Using a 3-inch biscuit cutter, cut biscuits, re-patting scraps to cut 8 biscuits.
Bake on parchment lined baking sheet for about 10 minutes or until golden. Remove from pan to cool on wire rack.
Using a chilled mixing bowl, whip cream, powdered sugar and vanilla until stiff peaks begin to form.
Split warm biscuits, spoon whipped cream and berries between. Top with additional berries and cream.