7 Shocking Facts About The Costco Double Chocolate Muffin Nutrition: The 2025 Muffin Change Explained

The Costco Double Chocolate Muffin has long been a legendary indulgence, but its nutritional profile is as massive as its size. As of late 2024 and early 2025, the beloved warehouse club has rolled out sweeping changes to its entire bakery muffin lineup, making the nutritional facts of the classic, jumbo-sized double chocolate treat a matter of history—or a cautionary tale. This deep dive reveals the final, staggering numbers of the original muffin and explains the major shift that has fundamentally changed what a Costco muffin means to loyal shoppers. The original Kirkland Signature Double Chocolate Muffin was an undisputed behemoth in the bakery world, packing a calorie count that rivaled a full meal. For years, the lack of clearly posted nutritional information only added to its mystique, but the numbers reveal why this treat was considered more of a dessert than a breakfast item. The shift away from the classic, super-sized 6-pack is a direct response to consumer trends and the sheer indulgence of the original product.

The Staggering Nutrition Profile of the Classic Costco Double Chocolate Muffin (Pre-2025)

The nutritional data below is based on the original, jumbo-sized Kirkland Signature Double Chocolate Muffin, which weighed approximately 5.8 ounces (167 grams) and was sold in the famous two-pack of six. This is the profile that has been widely tracked and discussed before the major 2025 bakery overhaul.

• Serving Size: 1 Muffin (approx. 167g / 5.8 oz)
• Total Calories: 689–690 kcal
• Total Fat: 38 grams (g)
  • Saturated Fat: Approximately 10–12g (High, contributing to 49% of the muffin’s total calories)
• Total Carbohydrates: 79 grams (g)
  • Dietary Fiber: 2–3g
  • Total Sugar: *Unconfirmed, but estimated to be over 40g (The high carb count and dessert-like nature suggest a very high sugar content).*
• Protein: 10 grams (g)
• Sodium: 590–640 milligrams (mg)
• Cholesterol: Approximately 125 mg

Fact 1: The Calorie Count Rivals a Full Meal

At nearly 700 calories per muffin, the classic double chocolate variety contained more calories than a McDonald's Big Mac (590 calories) or a large bowl of pasta. For an average adult following a 2,000-calorie diet, a single muffin accounted for over one-third of their daily caloric intake. This extreme density is a key reason why the product was often criticized by health experts and why the company may have opted for a reformulating or replacement.

Fact 2: A Muffin Dominated by Fat and Carbs

The macronutrient breakdown of the old Double Chocolate Muffin was heavily skewed towards fat and carbohydrates. Fat alone contributed nearly half (49%) of the total calories, while carbohydrates accounted for 45%. This profile is typical of a rich dessert rather than a balanced breakfast item, which is a common intention when purchasing a muffin. The 38g of total fat is a significant amount, especially the saturated fat content, which exceeds the daily recommended limit for many individuals.

The Major Costco Muffin Overhaul: What Changed in 2025?

The biggest news for Costco bakery fans in late 2024 and early 2025 was the complete shake-up of the muffin program. This change directly impacts the availability and nutritional profile of the double chocolate flavor.

Fact 3: The End of the Jumbo 6-Pack and Mix-and-Match Deal

For years, Costco sold its massive muffins in a two-pack of six (12 total) with a popular mix-and-match option. This deal has been discontinued. The new format features a smaller, single package containing eight muffins. This change addresses the common complaint that a 12-pack was simply too much for most households to consume before they went stale, leading to food waste.

Fact 4: The Double Chocolate Muffin Was Replaced or Reformulated

Reports from the bakery section indicate that the classic Double Chocolate Muffin was either replaced by a new, smaller, and potentially reformulated chocolate flavor, or it was removed from the standard rotation entirely. The new lineup focuses on flavors like Lemon Raspberry and Butter Pecan, suggesting a shift towards less indulgent, though still rich, flavor profiles. This move reflects a broader trend of Costco tweaking its beloved bakery items.

Fact 5: The New Muffins Are Reportedly Smaller and "Tastier"

Consumer reports on the new 8-pack muffins suggest a change in the product itself. The new muffins are physically smaller than the original "jumbo" size, which naturally results in a lower calorie count per serving. Furthermore, some fans have noted that the new recipes are "tastier" and more traditional, indicating a significant ingredient change from the old base. While official new nutrition facts for a chocolate flavor are still emerging, the reduced size alone suggests a calorie drop below the 689-kcal mark.

How to Enjoy the Costco Muffin Responsibly (The Post-2025 Strategy)

Whether you encounter the last of the jumbo originals or the newer, smaller versions, managing the indulgence is key. The Costco Double Chocolate Muffin, in any form, remains a high-calorie, high-fat, and high-carb treat.

Fact 6: Portion Control is Non-Negotiable

The single most effective strategy for enjoying the classic 689-calorie muffin was to treat it as two or even three servings. Cutting the muffin into halves or thirds and storing the rest immediately prevents accidental overconsumption. This turns a 690-calorie dessert into a more manageable 230–345 calorie snack. For the new, smaller 8-pack muffins, this advice is still valid, as even a smaller muffin will likely still contain a significant amount of sugar and fat.

Fact 7: It’s a Dessert, Not a Breakfast Staple

The high fat and carbohydrate content, coupled with the lack of fiber and high sodium, firmly categorize the Double Chocolate Muffin as a dessert. Starting your day with nearly 700 calories, 38g of fat, and a massive hit of sugar can lead to an energy crash and make it difficult to manage calorie intake for the rest of the day. It is best enjoyed as an occasional treat, perhaps split with a family member, and paired with a protein source like Greek yogurt or eggs to balance the high carbohydrate load. The classic Costco Double Chocolate Muffin was a bakery legend, but its massive nutritional profile—nearly 700 calories, 38g of fat, and 79g of carbs—ultimately defined it as an extreme indulgence. The major 2025 changes to the Costco bakery, including smaller portions and a new 8-pack format, signal an end to the era of the jumbo muffin. While the specific nutrition of the new chocolate offerings is still being finalized, the change itself encourages more mindful consumption of this beloved, yet calorically dense, treat.

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