A delightful twist on the classic butter tart squares, featuring a buttery crust and a rich, nutty filling.
Preheat your oven to 350°F (175°C).
Preheating ensures even baking from the start.
In a mixing bowl, combine the butter, flour, and brown sugar for the crust until crumbly.
Use cold butter for a crumbly texture.
Press the crust mixture evenly into a buttered 9x9 inch baking pan.
Ensure an even layer for consistent baking.
Bake the crust in the preheated oven for 15 minutes.
The crust should be lightly golden.
In a mixing bowl, whisk together the eggs, brown sugar, oatmeal, salt, vanilla, walnuts, and raisins for the filling.
Mix until all ingredients are well combined.
Pour the filling mixture over the partially baked crust.
Spread the filling evenly for uniform baking.
Return the pan to the oven and bake for an additional 20 minutes.
The filling should be set but slightly soft in the center.
Allow the tart to cool completely before cutting into squares.
Cooling ensures clean cuts and prevents crumbling.