Using a stand mixer, cream the butter, brown sugar, and 1/4 cup of granulated sugar until light and fluffy (2-3 minutes)
Add vanilla and eggs (one at a time) to the bowl and mix well
In a medium mixing bowl, whisk together flour, 2 tbsp of granulated sugar, cornstarch, baking powder, baking soda, and salt.
Slowly stir the dry ingredients into the wet ingredients until just combined
Stir in the strawberry jam until just combined
Fold in the strawberries and chocolate chunks
Cover and refrigerate for 1-2 hours (the longer the better)
Using a cookie scoop, scoop the cookie dough onto a well-greased baking sheet or lined with parchment paper.
Bake in the oven at 350°F for 10-12 minutes. Remove from the oven while the middle still feels a bit underbaked. They will continue baking as they cool on the cookie sheet
Once cookies are completely cooled (if they are still warm to the touch, the glaze will melt into the cookie)
GLAZE
Combine the powdered sugar and stir together until it forms a thick glaze, then drizzle over top of the cookies.