March 17, 2020



Get a jump start with on spring with the fresh flavors of coconut and key lime! These mug cakes are sweet with the perfect amount of citrusy tang. 

Coconut Key Lime Mug Cakes
   Instagram   Yummy 

This post is sponsored by Amoretti. All opinions and ideas expressed are my own.

The end is near at last! I'm talking about winter! In terms of snowfall amount, we have had it relatively easy. But it's March in New England and things can change in an instant. I'm looking forward to the start of spring and the long lasting warmth and sunshine! 

These cute little microwave cakes are a touch of tropical spring in a cup. With flavors of coconut, key lime, and the pale green color, eating them feels like an escape from the winter doldrums. They make me think of chirping birds, blue skies, and spring blooms. 

If you have never made mug cakes before, now is the time to try! They are  quick and easy. And with the help of Key Lime Marbleizing Swirl from Amoretti, they are super delicious to eat! The swirl comes ready to serve, but I discovered it also makes the most tasty mug cakes! This stuff is fruity, zesty, and adds fantastic flavor to the cakes. Get this, it is made with real fruit, naturally sweetened, and preservative free! So many reasons to like it! 

Currently, Amoretti is offering 15% off one order. Use coupon code SPRINGBAKING to take advantage of the savings!

Recipe Highlights:
  • Combine flour, baking powder, and salt in a bowl.
  • Combine cream of coconut, coconut milk, and oil in a bowl.
  • Add wet into the dry ingredients.
  • Add Key Lime Marbleizing swirl. Whisk to blend.
  • Add green food coloring.
  • Pour into well prepared microwaveable mugs.
  • Microwave 2 at a time for 3 to 3 1/2 minutes.
  • Make the coconut glaze: bring coconut milk, sugar, and cornstarch to a boil. Stir contanstanly until slightly thickened.
  • Drizzle glaze over cakes, warm or room temperature.
  • Garnish with peanuts.

Coconut Key Lime Mug Cakes

Helpful Tips:
  1. To prevent sticking, be sure to grease the mugs well, especially at the bottom. Use either baking spray or oil and flour.
  2. Baking time may vary depending on the mug size used and the strength of your microwave. Finding the perfect baking time for your microwave might require trial and error. Check for doneness sooner rather than later using the toothpick test. 
  3. The cake is done when the toothpick comes out with a few dry crumbs attached. Microwave a few more seconds if undercooked.
  4. As a guide, two 10 ounce cups in my 1000W microwave oven cooks in 3 1/2 minutes.
  5. Fill mugs no more that 2/3 full to prevent overflow.
  6. Place a paper plate under the cup while microwaving to catch any overflow.
  7. Mug cakes will continue to cook once removed from the oven. To prevent dried out cake, do not overcook.  

Coconut Key Lime Mug Cakes

Can these mugs cake be made ahead?
It is best to make these cakes as you need them. If you are pressed for time, they can be made hours or a day ahead. However, be sure not overcook. Carryover time will continue to cook the cakes while they sit for an extended amount of time in the mugs. Overcooked cakes will have a hard center. If this happens, reduce your cooking time the next time.

When and how to unmold the cakes?
Whether you are making ahead or consuming right away, wait 15 minutes after the cakes are removed from the microwave to unmold. Slide a thin knife down along the side of the mug to loosen the edges. Turn the mug upside-down onto a small plate and give it one firm shake.

If eating the cakes at a later time, slide the mug back over the cake and turn right side up. Keep the cake stored in mugs as they cool to prevent them from drying out. This pre-unmolding will allow you to remove the cake at a later time with ease. Cover with a plastic wrap once cooled. 

How to prevent sticking while unmolding the cake?
Use spray made especially for baking or grease and flour the mugs well. The bottom tends to stick. Prepping the mugs well ensure the cake unmold with ease.

Other microwave recipes you don't want to miss!


Coconut Key Lime Mug Cakes


1 1/2 cups all-purpose flour
1 tablespoon vegetable oil
1/8 teaspoon salt
1 1/4 teaspoon baking powder
1 cup sweetened cream of coconut (I use Goya)
1/4 cup canned coconut milk
3 tablespoons Amoretti Key Lime Marbleizing Swirl
green food coloring
salted roasted peanuts for garnish, chopped

For the glaze:
1/2 cup canned coconut milk
2 teaspoons sugar
1 teaspoon cornstarch

Suggested supplies:
10 ounce mugs
Mini whisk
Baking Spray

  1. Combine cream of coconut, coconut milk, and oil. 
  2. In a large bowl, combine flour, baking powder, and salt.
  3. Add wet to dry. Blend until just combined.
  4. Stir in key lime marbleizing swirl.
  5. Add enough green food coloring to obtain desired color. I use less than 1/8 teaspoon. Blend well.
  6. Spray four 10 ounce or larger mugs with baking spray or grease and flour well. 
  7. Fill 2 mugs no more than 2/3 full with cake batter.
  8. Place mugs in a paper plate lined microwave oven.
  9. Cook both for 3 to 4 minutes, depending on the strength of your microwave. 
  10. Repeat for the remaining two cups.
  11. Allow cakes to cool 15 minutes prior to unmolding. 
  12. To unmold, slide a thin knife around the edges and down to the bottom of the mug. Turn cake upside-down onto a small plate. Give one quick shake to loosen.
  13. To make the coconut glaze: Combine all ingredients in a small pan. Cook on medium high, stirring constantly until slightly thicken.
  14. Cake can be eaten warm or room temperature, drizzled with glaze. Garnish with peanuts.
Makes 4 servings.

Recipe Notes:
  1. To gauge your cooking time, my two 10 ounce cups in my 1000W microwave oven cook in 3 1/2 minutes. One cup requires 1 minute 45 seconds.
  2. Unmold cakes after allowing them to cool for 15 minutes. 
  3. If serving at a later time, you still need to unmold after 15 minutes. Return cakes back to mugs to cool completely. This allows them to unmold with ease when ready to serve. Keeping them in the mugs prevent the cake from drying out as is cools.
  4. Cover with plastic wrap once completely cooled.
  5. Slightly undercook about 10 seconds if serving hours or a day later. Carryover cooking in hot mugs during the extended cooling period will continue to cook the cakes.

Great finds for the home and family! Any commission made on purchases help towards the running of this blog.

Disclosure: This site contains paid advertising and affiliate links. In Good Flavor is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to


  1. My sister has been making mug cakes. Guess its time for me to try--and key lime is a fabulous flavor!

    1. Mug cakes are great, Inger! The trick is not to overcook them as they get tough. Stay well!!