Preheat the oven to 300°F/150°C.
In a small bowl, mix the all-purpose flour, brown sugar, white sugar, baking powder, vanilla, and oil with a fork or your hands until crumbs form. Spread the crumbs evenly onto a small lined baking tray and bake for 15 minutes. Set aside.
1/4 cup white sugar, 1 tbsp brown sugar, 5 tbsp all-purpose flour, 4 tbsp canola or vegetable oil, 1 tsp vanilla
In a small bowl, toss the strawberries and lemon juice together. Set aside.
2 tsp lemon juice, 1/2 cup diced strawberries
In a large bowl, cream the butter, brown sugar, and white sugar until light and fluffy. Use a spatula or electric mixer.
3/4 cups butter, 3/4 cups brown sugar, 1/4 cups white sugar
Add egg, egg yolk, and vanilla. Continue whisking for 2 minutes until paler in colour.
1 egg, 1 egg yolk, 1 tbsp vanilla
Toss in flour, baking powder, baking soda, and salt. A soft dough will form. Mix just until no flour streaks appear.
2 cups all-purpose flour, 1 tsp baking soda, 1/2 tsp baking powder, 1/4 tsp salt
Add in diced strawberries and 1/2 cup of the shortcake crumbs and mix in.
1/2 cup diced strawberries
Scoop the dough with a cookie scoop onto a prepared baking sheet. Press more shortcake crumbs onto the tops of each dough ball.
Chill the cookie dough balls in the freezer for 2-3 hours.
Once the cookies are chilled, preheat the oven to 350℉/180℃.
Place the cookie dough balls on a baking tray. Bake the cookies 6 or 8 at a time for 11-17 minutes. It took me 17 minutes. The cookies will be extremely soft in the middle, but you'll know it's ready when the edges are crisp.
After baking, you can press extra strawberries and shortcake crumbs if desired.
Let the cookies sit on the baking tray for 10 minutes before transferring them onto a tray to completely set. Enjoy!