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Key Lime Blondie Bars

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Total Time
Prep: 35 min. + chilling Bake: 25 min. + cooling

By Taste Of Home Editorial Team

Recipe by Kristin LaBoon, Austin, Texas

Tested by Taste of Home Test Kitchen

Taste of Home's Editorial Process

Updated on Jun. 10, 2023

Here’s my tropical take on a beloved treat. These Key lime bars combine the taste of the classic pie with a blondie batter and cream cheese frosting. You can make a thicker crust if desired. —Kristin LaBoon, Austin, Texas

Test Kitchen Approved

Key Lime Blondie Bars

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Yield: 16 servings
Prep: 35 min
Cook: 25 min
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Ingredients

  • 1-1/3 cups graham cracker crumbs, divided
  • 1/3 cup plus 2 tablespoons melted butter, divided
  • 3 tablespoons plus 1/4 cup packed brown sugar, divided
  • 2/3 cup butter, softened
  • 1 cup plus 1 tablespoon sugar, divided
  • 2 large eggs, room temperature
  • 1 large egg white, room temperature
  • 3 tablespoons Key lime juice
  • 4-1/2 teaspoons grated Key lime zest
  • 1 cup all-purpose flour
  • 1/2 teaspoon plus 1/8 teaspoon salt, divided
  • 1 teaspoon vanilla extract
  • 1/8 teaspoon ground cinnamon
  • frosting:
    • 1/4 cup butter, softened
    • 1/4 cup cream cheese, softened
    • 4 cups confectioners' sugar
    • 2 tablespoons 2% milk
    • 1 teaspoon vanilla extract
    • Key lime slices, optional
Text Ingredients

Directions

  1. Preheat oven to 350°. Line a 9-in. square baking pan with parchment, letting ends extend up sides. Combine 1 cup cracker crumbs, 1/3 cup butter and 3 tablespoons brown sugar; press onto bottom of prepared pan. Bake for 10 minutes. Cool on a wire rack.
  2. For blondie layer, in a large bowl, cream butter and 1 cup sugar until light and fluffy, 5-7 minutes. Beat in eggs, egg white, and lime juice and zest. In a small bowl, mix flour and 1/2 teaspoon salt; gradually add to creamed mixture, mixing well.
  3. Spread over crust. Bake until a toothpick inserted in center comes out clean, 25-30 minutes (do not overbake). Cool completely in pan on a wire rack.
  4. For streusel, combine remaining 1/3 cup cracker crumbs, 2 tablespoons melted butter, 1/4 cup brown sugar, 1 tablespoon sugar and 1/8 teaspoon salt, along with vanilla and cinnamon, until crumbly. Reserve 1/2 cup for topping.
  5. In a large bowl, combine frosting ingredients; beat until smooth. Stir in streusel. Spread over bars. Sprinkle with reserved 1/2 cup streusel. Refrigerate for at least 4 hours before cutting. Lifting with parchment, remove from pan. Cut into bars. Store in an airtight container in the refrigerator. If desired, garnish with sliced Key limes.

Nutrition Facts

1 blondie: 422 calories, 19g fat (11g saturated fat), 69mg cholesterol, 283mg sodium, 62g carbohydrate (51g sugars, 1g fiber), 3g protein.
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