Preheat your oven to 350°F. Line a baking sheet with a silicone baking mat or parchment paper and set aside.
In a small mixing bowl, combine the flour, brown sugar, and cinnamon for the crumble topping. Drizzle the melted butter over the mixture and mix with a fork until a crumbly texture forms.
Spread the crumble topping onto the baking sheet and bake for 10 minutes until golden brown. Set the crumble topping aside. You may turn your oven off at this point and preheat it again 10 minutes before baking the cookies.
Whisk the flour, salt, baking soda, and baking powder in a medium mixing bowl and set aside.
In the bowl of a stand mixer fitted with the paddle attachment, beat the butter and sugar on medium-high (6-8 on a stand mixer) for 3 to 5 minutes until light and fluffy. Beat in the egg and vanilla on medium speed until combined.
Scrape down the bottom and sides of the mixing bowl and mix in the flour mixture in three batches, beating until no more streaks of dry flour are visible after each addition. Start on low speed and gradually increase to medium. Fold in ¾ cup of the strawberries until evenly incorporated.
Cover the bowl tightly with plastic wrap and refrigerate the dough for at least an hour up to overnight.
Use a 1-tablespoon-sized cookie scoop to portion the cookie dough and place cookies on lined baking sheets about 2 inches apart. Bake cookies in the preheated oven for 9 to 12 minutes until the edges are golden brown and the centers are slightly gooey.
Top freshly baked cookies with 2 to 3 more strawberry pieces. Allow cookies to cool for 10 minutes on the baking sheet before transferring them to a wire rack to cool completely.