Blackberry Jam Bar Cookies

Ingredients

• 1 teaspoon double-acting baking powder 
• 1.5 cups garnish: blackberry jam 
• 16 tablespoons butter unsalted chilled cut into small pieces and (2 sticks)
• 1 large egg yolk lightly beaten
• 3 cups flour all-purpose
• 1.5 cups pecans toasted
• 1 teaspoon salt 
• 0.8 cup sugar 

Equipment

• food processor
• bowl
• frying pan
• oven
• baking pan
• aluminum foil

Directions

1. Preheat oven to 350F. Line a 9-by-13-inch baking pan with foil, leaving a 2-inch overhang on both long ends. Mist foil with cooking spray.
2. Pulse pecans and sugar in a food processor until finely ground. Pulse in flour, baking powder and salt. Pulse in 16 Tbsp. butter until mixture resembles coarse meal.
3. Transfer half of mixture to a bowl, cover and chill. Pulse egg and yolk with mixture in processor until dough forms a ball. Press dough into a thin, even layer in baking pan.
4. Bake until lightly browned around edges and set in center, 20 minutes.
5. Let cool slightly.
6. Using your fingers, work remaining 2 Tbsp. butter into reserved crumble mixture.
7. Spread jam evenly over crust.
8. Spread crumble mixture over jam.
9. Bake until top is golden, 30 to 35 minutes.
10. Let cool on a rack for at least 1 hour. Lift bars from pan and place on a rack to cool completely. Peel off foil and cut into 24 bars.