Caramel Praline Walnut Bars

From a baking magazine by "Land O Lakes". These sound yummy!

• Ready In: 54 mins
• Serves: 48

Ingredients

• Crust

• 1 3⁄4 cups flour
• 1⁄3 cup brown sugar
• 1⁄4 teaspoon baking powder
• 3⁄4 cup butter, softened

• Topping

• 1⁄3 cup butter
• 1 1⁄2 cups  chopped walnuts
• 1⁄2 cup sugar
• 1⁄2 cup brown sugar
• 1⁄2 cup light corn syrup
• 1  tablespoon water
• 1  teaspoon salt
• 1⁄3 cup heavy whipping cream
• 1 1⁄2 teaspoons vanilla

Directions

1. Preheat oven to 350. Line 13 x 9 inch pan with aluminum foil, extending foil over edges. Butter foil on bottom and up sides of pan.
2. Combine flour, 1/3 cup brown sugar and baking powder in large bowl; cut in 3/4 cup butter until mixture resembles coarse crumbs. Pat mixture onto bottom of prepared pan. Bake for 15 minutes or until edges are lightly browned.
3. Melt 1/3 cup butter in 2 quart saucepan over low heat, stirring constantly. Stir in walnuts, sugar, 1/2 cup brown sugar, corn syrup, water and salt. Increase heat to medium. Cook, stirring occasionally, until mixture comes to a boil. Continue boiling until candy thermometer reaches 248. Stir in cream and vanilla.
4. Pour filling mixture over hot, partially baked crust. Bake for 14-16 minutes or until mixture bubbles over entire surface. Cool completely. Lift out of pan, using foil. Cut into bars.