• Line an 8-inch square metal pan with foil and spray foil with cooking spray.
• Stir flour, baking powder, and salt together in a small bowl.
• Cream butter and sugar in a large bowl.. Beat in egg and vanilla, then add flour mixture and mix until just combined.
• Press dough into bottom of pan and chill for about 20 minutes.
• Meanwhile, preheat the oven to 375 degrees F. When dough is chilled, bake it for about 15 minutes or until edges are golden. Let it cool on a rack while you make the pecan topping.

Caramel Pecan Topping

• Cook sugar in a small metal saucepan over moderate heat, undisturbed, until it begins to melt. Continue to cook, stirring occasionally with a fork, until sugar is melted to a deep golden caramel. Tilt pan and carefully pour in cream (caramel will harden and steam vigorously). Since this is a small batch, you’ll need to watch a little closer for burning at this point. Cook over moderately low heat, stirring, until caramel is dissolved. Remove from heat and stir in butter, vanilla, salt, and pecans.
• Quickly spread topping over cooled crust and bake until bubbling, about 13 minutes. Cool completely in pan on rack (Mine were cool enough to cut in 1 hour, but they firmed up considerably after I’d cut them). Grasp foil, lift bars from pan and cut into triangles or squares. I cut mine into 9 squares then cut those squares to make 18 triangles.