Blueberry Bars a La Orisleuth

I'm posting this, but the credit should go to Orisleuth, a fellow member of the Purple Ilk. . .

• Ready In: 1 hr 5 mins
• Serves: 24

Ingredients

• 1  cup butter or 1  cup margarine
• 1 3⁄4 cups sugar (divided)
• 3  eggs
• 2 1⁄4 cups flour
• 1  teaspoon vanilla
• 2  cups blueberries
• 1⁄4 cup walnuts, finely chopped

Directions

1. Cream butter and 1 cup of sugar.
2. Add 2 eggs, flour and vanilla.
3. Press half of the mixture into the bottom of a 13"x9" baking pan.
4. Cover with blueberries.
5. Sprinkle with 1/2 cup of the sugar.
6. Press remaining dough on top of berries.
7. Lightly beat the remaining egg and brush it over the top.
8. Combine the remaining 1/4 cup of sugar and nuts.
9. Sprinkle over the egg.
10. Bake at 350º for 45 minutes.