Creating delicious Butter Tart Squares is a breeze when you follow these simple steps:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C). Prepare an 8-inch square baking pan by greasing it or lining it with parchment paper for easier removal.

2. Mix Crust Ingredients: In a medium bowl, combine the flour, granulated sugar, and salt. Then cut in the softened butter until the mixture resembles coarse crumbs.

3. Form the Crust: Press the crust mixture evenly into the bottom of your prepared baking pan to create an even layer.

4. Bake the Crust: Place the crust in the preheated oven and bake for about 15 minutes, or until lightly golden.

5. Prepare the Filling: While the crust is baking, whisk together the eggs, brown sugar, corn syrup, and vanilla extract in a separate bowl until smooth and well combined.

6. Add Optional Ingredients: If using raisins or pecans, fold them gently into the filling mixture.

7. Combine: Once the crust has been baked, remove it from the oven and pour the filling evenly over the hot crust.

8. Bake Again: Return the baking pan to the oven and bake for an additional 25-30 minutes, or until the filling is set and slightly puffed.

9. Cool Down: Remove the pan from the oven and let the Butter Tart Squares cool in the pan for 15-20 minutes before transferring them to a wire rack.

10. Cut and Serve: Once completely cool, cut them into squares and enjoy this amazing treat!