Bake Exchange Butter Tart Bars

I received these from Pamela's annual baking exchange and thought that I'd share the recipe.

• Ready In: 50 mins
• Yields: 27 bars

Ingredients

• BOTTOM LAYER

• 1⁄2 cup butter or 1⁄2 cup  hard margarine, softened
• 1⁄3 cup brown sugar, packed
• 1 1⁄4 cups flour

• SECOND LAYER

• 2  large eggs
• 1  cup brown sugar, packed
• 1  teaspoon flour
• 1⁄2 teaspoon baking powder
• 1⁄4 teaspoon salt
• 1⁄4 cup butter or 1⁄4 cup margarine, melted
• 1  teaspoon vanilla extract
• 1 1⁄2 cups raisins
• 1⁄2  chopped walnuts

Directions

1. BOTTOM LAYER.
2. Crumble all 3 ingredients together in a bowl.
3. Press into ungreased 9x9" pan.
4. Bake at 350°F for 15 minutes.
5. SECOND LAYER.
6. Mix eggs and brown sugar with spoon.
7. Add the rest of the ingredients.
8. Stir and spread over bottom layer.
9. Bake at 350°F for 20 minutes or until light brown.