Key Lime Crumble



Well, you’re about to realize just how much I tend to bake in the summer. I have no idea why. You would think that winter, a time when we pack on the pounds and hole up inside our houses, would be when I bake, but it’s actually the fresh fruit etc that get my creative juices going.


These Key Lime Crumble bars are really creamy, light, and buttery. I love the crumbly crust and the crunch from the oats. It would be a great summer BBQ or 4th of July Dessert.



Growing up we always spent every 4th of July at the Elmer’s pool. They were good friends with my parents and a group of other families that all met around the same time. Every year we would be caramel brownies and


Key Lime Crumble bars. A buttery crust and topping with a creamy, tart lime center


the other families would bring their favorite desserts or side dishes. I seriously can remember the spread perfectly. It was such an awesome array of food. The kids spent the whole day in the pool while the parents sat around talking. I’d say it ended up sprinkling (which if you are from the Northwest you know it’s totally different than rain, pouring, misting etc) most 4th of July BBQ’s but for the most part we didn’t care. We swam anyway and the parents just sat on the porch out of the rain. It was lovely. Sometimes I miss having a tradition like that, but I’m excited to begin our own traditions. What’s your 4th tradition?



Is Key Lime Different Than a Regular Lime?

Key limes are smaller than the standard Persian limes and have thin, leathery skin.

Key limes have a bolder, slightly herbal-floral aroma and have a more acidic flavor than other limes.

 Key lime is valued for its unique flavor compared with other limes.


Can You Substitute Regular Limes For Key Lime?

You can substitute a combination of regular fresh lime juice and fresh lemon juice in equal proportions for key lime.

You will need the combination of lemon and lime to create a similar taste to key lime.


What Can You Substitute For Sweetened Condensed Milk? 

You can substitute evaporated milk for sweetened condensed milk and add sugar.

Use 5 fluid ounces of evaporated milk and ¾ of a cup of granulated sugar for 1 cup of condensed milk.



Key Lime Crumble

Key Lime Crumble bars. A buttery crust and topping with a creamy, tart lime center
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Key Lime Crumble

Prep Time2 hrs 15 mins
Cook Time25 mins
Total Time2 hrs 40 mins
Course: 100 Best Brownies and Bars Recipes
Keyword: bars, crumble, dessert, key lime, oats
Servings: 1 batch
Calories: 3975kcal
Author: Sweet Basil


  • 1 Tablespoon Lime Zest
  • 1/4 cup 2-3 Limes Lime Juice
  • 1 Large Egg Yolk
  • 1 Can 14oz Sweetened Condensed Milk
  • 10 Tablespoons Butter softened slightly, but still chilled*
  • 1 Cup Flour
  • 1 Cup Brown Sugar
  • 1 Cup Oats
  • 1 Teaspoon Baking Soda
  • 1 Pinch of salt


  • Heat the oven to 350, and grease an 8x8 inch baking dish.
  • Whisk the egg yolk, lime juice, zest and sweetened condensed milk together in a small bowl until smooth.
  • In a separate bowl, using a pastry cutter, or fork, mix together the flour, butter, brown sugar, oats, baking soda and salt. At the end I like to use my hands to incorporate the butter a little more evenly into the mix.
  • Press half of the dry oat mixture into the pan and bake for 9-10 minutes.
  • Remove from the oven and pour the Lime mixture over the crust.
  • Sprinkle the remaining oat mixture evenly over the top and place back in the oven for an additional 15 min.
  • Allow to cool and place in the fridge for 1-2 hours and serve.


*I get the the butter out about 15 minutes before I need it and let it sit on the counter. This way it isn't rock solid, but still has a chill on it when I go to mix it in.


Serving: 1g | Calories: 3975kcal | Carbohydrates: 563.7g | Protein: 75.1g | Cholesterol: 624.7mg | Fiber: 20.8g | Sugar: 358.4g
Tried this recipe?Mention @OhSweetBasil or tag #OhSweetBasil!

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Carrian Cheney

Lover of all things beautiful, good and delicious. Wife, mother, friend, foodie.

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5 comments on “Key Lime Crumble”

  1. you should fix the glitch in your system that capitalizes the t in the word teaspoon on every recipe when it is copied. Sometimes you abbreviate it as ts so it shows up as Ts, making someone think it is a Tablespoon!!!

    • Thanks for your comment If anything ever shows on any recipe as ts it’s always ts while tb is tablespoon. It used to be how the majority of recipes were written. 🙂

  2. I adore anything citrus and think these would be perfect for any party!!

  3. These look so good and refreshing…

  4. Looks like a great dessert. We usually BBQ ribs with my in-laws and do fireworks in the street once it gets dark.