In a medium bowl, whisk together the flour, cornstarch, baking powder, salt, and strawberry powder. Set aside.
In a large mixing bowl, beat the butter and sugar until light and fluffy, about 3 minutes.
Add the egg, egg yolk, vanilla extract, and almond extract. Beat until smooth and fully combined.
Gradually mix the dry ingredients into the wet ingredients, mixing only until incorporated.
If desired, add a small amount of pink gel food coloring and mix until evenly distributed.
Cover the dough and refrigerate for 1 hour.
Preheat the oven to 350°F. Line baking sheets with parchment paper.
Scoop the dough into 2-tablespoon portions and roll into balls.
Roll each dough ball in the additional granulated sugar.
Place the dough balls 2 inches apart on the prepared baking sheets and gently flatten the tops.
Bake for 10–12 minutes, or until the edges are set and the centers still look slightly soft.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.
For the optional frosting, beat the butter until creamy. Add the powdered sugar, strawberry powder, vanilla extract, and salt. Mix in enough heavy cream to create a smooth, fluffy frosting. Spread or pipe onto the cooled cookies.