Jumbo Chocolate Chunk Muffins Recipe (Costco Copycat)

Jumbo Chocolate Chunk Muffins inspired by Costco Chocolate Muffins.  These muffins are easily made using a cake mix and chocolate chunks.  These muffins are great for breakfast or dessert!

Jumbo Chocolate Chunk Muffins

Costco copycat jumbo chocolate chunk muffin cut in half to show melted chocolate inside.
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I don't know if you have ever had a Costco Chocolate Muffin before but they are so delicious and they're huge! The "secret" ingredient for their muffins is really just cake mix!

So much for thinking they were nutritious, huh? I always thought they were too delicious to really be breakfast food. My kids enjoy these muffins and I will be making more varieties soon! I'm thinking blueberry and cinnamon streusel!

When I made these muffins I filled them almost full. If you want muffins with huge muffin tops I would suggest only make about 6 muffins and fill the liners a little more to achieve the muffin top you desire.

These muffins came out really well and I think next time I make them I may double my batch and have larger and more muffins! It's not even 24 hours later and these muffins are gone! They're that good!

When these Jumbo Chocolate Chunk Muffins came out of the oven my house filled with the smell of chocolate. It was so wonderful and my son couldn't wait to try one.

The chocolate chunks melting into the muffin only made the wait even harder for him!

Costco copycat jumbo chocolate chunk muffins without wrapper beside a glass of milk.

Costco Copycat Jumbo Chocolate Chunk Muffins Recipe

Overall, I was very pleased with the way these muffins turned out and everyone in the house really enjoyed them. Every bite had a chocolate chunk it had the great texture of a muffin. I call them a success! I'd say my family thinks so, too!

RELATED: Chocolate Chip Cookies (DoubleTree Copycat) 

A hand holding out a large chocolate muffin with fresh raspberries and chocolate pieces on a white plate.

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📖 Recipe

Jumbo Chocolate Chunk Muffins Recipe

Dana
These muffins are inspired by Costco bakery muffins.  With a chocolate chunk in every bite, these muffins are full of flavor and full of chocolate. 
4.70 from 36 votes
Prep Time 5 minutes
Cook Time 10 minutes
Total Time 15 minutes
Course Breakfast
Cuisine American
Servings 8 muffins
Calories 43 kcal

Ingredients
  

  • 1 25 ounce box chocolate cake mix
  • 1 cup milk
  • ¾ stick butter - melted
  • 2 teaspoon baking powder
  • 1 bag chocolate baking chunks
  • 3 eggs

Instructions

  • Preheat oven to 375°F
  • Line jumbo muffin tins with liners.
  • Combine melted butter, eggs, milk, and baking powder in large mixing bowl.
  • Add in chocolate cake mix, stir until blended.
  • Stir in chocolate chunks, just until mixed.
  • Fill liners ¾ way full or fuller for less muffins but higher muffin top (will get less muffins this way).
  • Bake for about 20 minutes. Check muffin with toothpick. They are done with muffins come out clean - do not over bake. They will become dry.
  • Remove from muffin tins to remove from heat.

Video

Notes

Tip:  To achieve a fuller muffin fill liners all the way. 
Tip:  Resist the temptation to open the oven while the muffins are rising.  It will cause the muffins to fall. 

Nutrition

Serving: 1muffin | Calories: 43kcal | Carbohydrates: 2g | Protein: 3g | Fat: 3g | Saturated Fat: 1g | Polyunsaturated Fat: 0.4g | Monounsaturated Fat: 1g | Trans Fat: 0.02g | Cholesterol: 65mg | Sodium: 142mg | Potassium: 69mg | Fiber: 0.003g | Sugar: 2g | Vitamin A: 139IU | Calcium: 106mg | Iron: 0.4mg

Nutritional information is an estimate based on third-party calculations. Actual values may vary due to ingredients, measurements, and serving sizes.

© Mama Needs Cake

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25 Comments

  1. I was explaining to the fella how awesome the chocolate Costco muffins were when you warmed them up and ate them with a glass of milk. This recipe looks like a killer copycat. Love it!

  2. I think these jumbo muffins would be a perfect surprise for my chocoholic hubby, who probably has never seen bigger muffins. In combination with the raspberries they look almost healthy;)

  3. OMGEEE – I’ve had a jumbo chocolate chunk muffin from Costco before and wow – yours sounds so good! Put me alone in a room with a tray of these and they’d be gone in 0-60 seconds – no lie!

  4. I was explaining to the fella how awesome the chocolate Costco muffins were when you warmed them up and ate them with a glass of milk. This recipe looks like a killer copycat. Love it!

  5. I think these jumbo muffins would be a perfect surprise for my chocoholic hubby, who probably has never seen bigger muffins. In combination with the raspberries they look almost healthy;)

  6. OMGEEEE I love Costco’s chocolate muffins! I must try this recipe your picture looks great!

  7. Dana, I love that the recipe doesn’t require a bunch ingredients! I LOVE chocolate. I can not wait to make these and watch them go quickly because the kids have eaten them all.

  8. Dana, I love that the recipe doesn’t require a bunch ingredients! I LOVE chocolate. I can not wait to make these and watch them go quickly because the kids have eaten them all.

  9. I'm making these right now and just wondering.....is the batter supposed to be so thick? Almost like a mouse texture.

  10. These were not good....texture was off, likely to calling for too many eggs? It is chewy and gross...

    The cooking time was wayyy off... maybe I did something wrong but I reread the recipe multiple times prior to baking!

    Do not reccomend.

  11. I just made these and they are absolutely amazing. I added some coffee to mine and some marshmallows as well.
    They turned out to be amazing 🤩 I think ALOT of the things I bake has to do with the way you think about what you are doing. If you go into the kitchen questioning everything and saying to yourself this recipe is not going to work out I guarantee you are going to have issues. But if you walk in the kitchen and are confident in what you are making you will be amazed. I love baking and I try all sorts of recipes. 3/4 of them come out wonderful 👍

4.70 from 36 votes (22 ratings without comment)

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