Preheat the oven to 350°F (175°C) and prepare a 9x9-inch baking dish.

In a large mixing bowl, combine softened butter with brown sugar, baking soda, rolled oats, and flour.

Reserve about 2 cups of the oat mixture for topping and press the remaining mixture into the bottom of the prepared baking dish.

Spread the apricot preserves generously over the prepared crust.

Sprinkle the reserved oat mixture evenly over the apricot layer and gently press down.

Bake for 30-35 minutes until the top is golden brown and the preserves are bubbling.

Allow to cool completely in the pan before cutting into squares.