Creme Fraiche vs. Sour Cream: Why One is Better for Cooking

Creme Fraiche vs. Sour Cream: Why One is Better for Cooking is a easy American (Keto) recipe that serves 4. 100 calories per serving. Recipe by Serious Keto on YouTube.

Prep: 10 min | Cook: PT0M | Total: 15 min

Cost: $3.20 total, $0.80 per serving

Ingredients

  • 2 tablespoons Cultured Buttermilk (store‑bought cultured buttermilk or a previous homemade batch; acts as starter)
  • 14 fluid ounces Whole Milk (use whole milk for best thickness; fill to 1‑pint jar after adding starter)
  • 3 tablespoons Cultured Buttermilk (same starter as above; for crème fraîche)
  • 14 fluid ounces Heavy Whipping Cream (minimum 36% fat; fill to 1‑pint jar after adding starter)

Instructions

  1. Make Cultured Buttermilk

    Add 2 tablespoons of cultured buttermilk to a clean pint jar, fill the jar with whole milk, screw the lid on tightly, and shake vigorously until fully combined. Place the jar on the counter at about 72°F for 24 hours.

    Time: PT5M

    Temperature: 72°F

  2. Make Homemade Crème Fraîche

    In another clean pint jar, add 3 tablespoons of cultured buttermilk, fill the jar with heavy whipping cream, seal the lid, and shake well. Let the jar sit at room temperature (≈72°F) for 24 hours.

    Time: PT5M

    Temperature: 72°F

  3. Refrigerate and Use

    After 24 hours, transfer both jars to the refrigerator. The cultured buttermilk is ready for baking, marinades, or keto breading. The crème fraîche can be used as a topping, in sauces, or whipped with a touch of vanilla for keto frosting.

    Time: PT0M

Nutrition Facts

Calories
100
Protein
1g
Carbohydrates
1g
Fat
10g
Fiber
0g

Dietary info: Keto, Low‑Carb, Gluten‑Free, Vegetarian

Allergens: Dairy

Last updated: April 18, 2026

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Creme Fraiche vs. Sour Cream: Why One is Better for Cooking

Recipe by Serious Keto

Learn how to culture your own buttermilk and turn it into rich, low‑carb crème fraîche using just a pint jar, a bit of starter, milk or heavy cream, and 24 hours at room temperature. Perfect for keto cooks who want a cheap, fresh alternative to store‑bought cultured dairy.

EasyAmerican (Keto)Serves 4

Shop all ingredients on Amazon in one click • Printable PDF with shopping checklist

Source Video
10m
Prep
0m
Cook
10m
Cleanup
20m
Total

Cost Breakdown

$3.20
Total cost
$0.80
Per serving

Critical Success Points

  • Shake the jar vigorously to fully incorporate the starter
  • Maintain room temperature around 72°F during the 24‑hour fermentation
  • Allow the full 24‑hour fermentation before refrigerating

Safety Warnings

  • Ensure the jar is tightly sealed to prevent contamination
  • Do not leave the mixture at room temperature longer than 48 hours to avoid spoilage
  • Discard if you notice mold, off‑smell, or discoloration

Frequently Asked Questions

Everything you need to know about this recipe

Q

What is the cultural significance and history of cultured buttermilk in American keto cuisine?

A

Cultured buttermilk has long been used in American cooking for its tangy flavor and tenderizing properties. In keto circles, it provides a low‑carb, dairy‑rich alternative to regular milk for baking and sauces, preserving traditional flavors while fitting a high‑fat, low‑carb diet.

cultural
Q

What are the traditional regional variations of crème fraîche in French cuisine compared to the keto version made on the Serious Keto channel?

A

Traditional French crème fraîche is made with raw cream and a bacterial starter, resulting in a thick, slightly nutty product. The Serious Keto version uses heavy whipping cream and cultured buttermilk as the starter, yielding a similarly creamy texture but with a milder tang that suits keto desserts and sauces.

cultural
Q

How is homemade crème fraîche traditionally served in French cuisine, and how can I use the Serious Keto version in a keto meal?

A

In France, crème fraîche is often served with fruit, used in sauces, or dolloped on soups. The Serious Keto crème fraîche works the same way—stir it into keto stroganoff, top berries, or sweeten with stevia for a low‑carb frosting.

cultural
Q

What occasions or celebrations is cultured buttermilk traditionally associated with in American cooking?

A

Cultured buttermilk is a staple in Southern comfort foods, especially biscuits, pancakes, and fried chicken. Keto cooks use it for the same occasions, swapping out high‑carb flour for almond or coconut flour while keeping the classic tang.

cultural
Q

What makes the Serious Keto homemade crème fraîche special compared to store‑bought versions?

A

The Serious Keto version is made from heavy whipping cream and a small amount of cultured buttermilk, giving it a richer fat content and a milder tang that doesn’t curdle when heated—ideal for keto sauces and frostings where store‑bought versions may separate.

cultural
Q

What other keto‑friendly dishes pair well with the homemade crème fraîche from Serious Keto?

A

It pairs beautifully with keto stroganoff, low‑carb vegetable gratins, keto waffles, and as a topping for berries or a base for a savory herb dip.

cultural
Q

Why does the Serious Keto recipe use a 24‑hour room‑temperature fermentation instead of a commercial starter culture?

A

A 24‑hour room‑temperature fermentation mimics the natural bacterial growth found in store‑bought cultured buttermilk, allowing home cooks to create a starter without buying a specialized culture, which aligns with the DIY ethos of the Serious Keto channel.

technical
Q

What are the most common mistakes to avoid when making cultured buttermilk and crème fraîche on the Serious Keto channel?

A

Common mistakes include using low‑fat milk or cream (which won’t thicken), not shaking the jar enough to distribute the starter, and exposing the jars to temperatures above 80°F, which can cause off‑flavors or spoilage.

technical
Q

Can I make the Serious Keto cultured buttermilk ahead of time and how should I store it?

A

Yes, you can make a batch and keep it refrigerated for up to two weeks. Store it in a sealed pint jar, label with the date, and always use a clean spoon to avoid contamination.

technical
Q

What does the YouTube channel Serious Keto specialize in?

A

The YouTube channel Serious Keto specializes in low‑carb, high‑fat recipes that fit a ketogenic lifestyle, focusing on practical home cooking, dairy tricks, and cost‑effective keto meal planning.

channel

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