In a mixing bowl, combine flour, powdered sugar, and salt. Add softened butter, egg, and 1/4 teaspoon vanilla extract. Mix until a dough forms.
Preheat the oven to 350°F. Roll the dough into small balls and press them into the shape of taco shells using a muffin tin. Bake for 10-12 minutes or until golden brown. Allow to cool completely.
In another bowl, beat the cream cheese, granulated sugar, and 1 teaspoon vanilla extract until smooth. Gently fold in the whipped topping until well combined.
Once the taco shells are cool, fill each shell with the cream cheese mixture. Top with sliced strawberries and sprinkle with graham cracker crumbs. If desired, drizzle with melted chocolate chips.
Chill the filled tacos in the refrigerator for at least 30 minutes before serving to allow flavors to meld.