Key Lime Cake is a bright, tangy, and refreshing dessert that captures the essence of key lime pie in a soft, moist, and incredibly easy cake. This recipe is a celebration of simple, vibrant flavors, where a box of white cake mix and instant key lime pudding come together with key lime soda to create a cake that’s bursting with citrusy flavor. The magic begins with a quick, no-fuss batter that’s poured into a slow cooker and baked to perfection. The result is a tender, moist cake with a subtle tang and a sweet, tangy glaze that takes it over the top.
The brilliance of this cake lies in its simplicity and the way the key lime soda and pudding mix infuse the cake with bright, citrusy flavor. The slow cooker does all the work, creating a cake that’s moist and tender with a beautiful, soft crumb. Drizzled with a simple key lime glaze, it’s a dessert that’s perfect for any occasion, from summer gatherings to holiday dinners.
WHY YOU’LL LOVE THIS RECIPE
- Bright, tangy key lime flavor — a refreshing twist on classic cake.
- Slow cooker easy — just mix, pour, and let the slow cooker do the work.
- Incredibly moist — the pudding mix and soda keep the cake tender and soft.
- Simple glaze — a sweet, tangy finish that takes it over the top.
- Perfect for any occasion — great for parties, potlucks, or a simple dessert.
INGREDIENTS
- 1 (15.25-ounce) box white cake mix
- 1 (3.4-ounce) box instant key lime or lime-flavored pudding mix
- 1 cup key lime soda or lemon-lime soda (use regular soda, not diet)
- ⅓ cup neutral oil (vegetable or canola oil)
- 1 cup powdered sugar (for the glaze)
- 2 to 3 tablespoons key lime soda or lemon-lime soda (for thinning the glaze)
- Nonstick spray or oil for greasing the slow cooker
- 1 strip parchment paper (optional, for lifting out the cake)
INSTRUCTIONS
Step 1: Prepare the Slow Cooker
Lightly grease the bottom and about 2 inches up the sides of a 5- to 6-quart slow cooker with nonstick spray or a thin smear of oil. Add a parchment strip with overhanging handles if desired for easy removal.
Step 2: Make the Batter
In a large bowl, whisk together the white cake mix and instant key lime or lime pudding mix until the pudding powder is evenly distributed. Pour in 1 cup of key lime or lemon-lime soda and the ⅓ cup oil, then stir with a spoon or spatula just until the batter is smooth and combined.
Step 3: Cook the Cake
Scrape the batter into the prepared slow cooker and smooth the top into an even layer. Cover and cook on HIGH for 2 to 2½ hours, or on LOW for 3½ to 4 hours, checking toward the earlier end of the range. The cake is done when the center is set, the top looks dry, the edges pull back slightly, and a toothpick comes out with a few moist crumbs but no wet batter.
Step 4: Cool the Cake
Turn off the slow cooker, carefully remove the lid, and let the cake cool in the insert for at least 20 to 30 minutes.
Step 5: Make the Glaze
While the cake cools, whisk the powdered sugar with 2 tablespoons of soda until smooth, adding up to 1 more tablespoon of soda a little at a time if needed to make a thick but pourable glaze.
Step 6: Glaze and Serve
Drizzle the glaze over the warm cake, let some soak into the top, then slice into squares or wedges and serve warm or at room temperature.
TIPS
- Use regular soda, not diet — the sugar in regular soda helps the cake rise and adds moisture.
- Don’t overmix — stir just until the batter comes together to keep the cake tender.
- Check early — slow cooker temperatures vary, so start checking at the earlier end of the range.
- Let it cool slightly — the cake is easier to slice and the glaze sets better when it’s slightly warm.
- Garnish with zest — a sprinkle of lime zest on top adds a beautiful pop of color and extra flavor.
STORAGE OPTIONS
Refrigerator: Store leftovers in an airtight container in the refrigerator for up to 5 days.
Room Temperature: This cake can also be stored at room temperature for up to 2 days.
Key Lime Cake is a bright, tangy, and utterly delicious dessert that’s incredibly easy to make. With its moist, tender crumb and sweet, citrusy glaze, it’s a cake that will have everyone asking for seconds. Enjoy!
