Preheat the oven to 350 degrees F (175 degrees C).

In a medium bowl, combine 1/2 cup brown sugar, 1/2 cup butter, 1/2 cup flour, and 3/4 cup rolled oats.

Mix until the mixture is crumbly.

Press the crumbly mixture into the bottom of a 9-inch square pan.

Bake the crust for 15 minutes.

In the same bowl, mix together 2 eggs, 1 cup brown sugar, 1/2 cup flour, 1/4 teaspoon salt, 1/2 teaspoon baking powder, and 1 teaspoon vanilla extract.

Mix until well blended.

Stir in 3/4 cup raisins, 1/2 cup flaked coconut, and 1/2 cup pitted sour cherries.

Add a small amount of reserved cherry juice to adjust consistency if the mixture is too stiff.

Spread the raisin mixture evenly over the pre-baked crust.

Bake for 30 minutes, or until firm and lightly browned.

Let the squares cool completely before cutting into bars.