Lightly coat an 8x8-inch pan with cooking spray and preheat the oven to 450 degrees.
Place flour and 1/4 cup sugar in a large bowl. Stir to combine.
Scatter butter pieces on top and use a pastry blender to cut the butter into the flour mixture until there are no pieces larger than a pea.
Whisk the half-and-half and egg together and add to flour mixture.
Stir with a fork just until dry ingredients are moistened and it forms a dough.
Transfer dough to prepared pan and use your fingers to spread it into an even layer. Brush the top of dough with a little half-and-half.
Place in oven and bake for 18 to 20 minutes or until golden brown on top.
While it is baking, combine strawberries and remaining 1/4 cup sugar in a medium bowl. If desired, you can mash some of the strawberries with a fork.
Using an electric mixer, beat cream. Once it starts to thicken, add powdered sugar and continue to beat until soft peaks form. (Note: It helps if you chill the bowl you will be whipping the cream in beforehand.)
Cut biscuit into 4 squares. Slice each biscuit in half and sandwich strawberries and whipped cream between the halves. Place extra strawberries and cream on top.