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
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
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
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
Ingredient Substitutions
- Instead of Cultured Buttermilk: plain yogurt thinned with milk, sour cream thinned with milk
- Instead of Whole Milk: 2% milk, raw milk
- Instead of Cultured Buttermilk: plain yogurt thinned with milk
- Instead of Heavy Whipping Cream: full‑fat coconut cream (non‑dairy)
Equipment Needed
- Pint Jar with Screw Lid
- Whisk (optional)
Critical Steps — Do Not Skip
- 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
Chef Tips from the Video
- Use a glass jar rather than plastic to avoid flavor transfer
- For an extra‑creamy crème fraîche, let it sit an additional 4‑6 hours in the fridge before using
- If you prefer a tangier flavor, increase the starter to 4 tablespoons for the buttermilk batch
Troubleshooting
The mixture separates into watery and curdled layers after fermentation
Give the jar a gentle shake before refrigerating; ensure the starter was fresh and the jar was kept at a stable 70‑75°F
Off‑smell or visible mold on the surface
Discard the batch immediately; clean the jar thoroughly and start a new batch with a fresh starter
Storage
Refrigerator: Up to 2 weeks in a sealed jar
Freezer: Not recommended; texture may change
Room temperature: Only during the 24‑hour fermentation period
Make-Ahead Tips
- Keep a small amount of cultured buttermilk as a starter for future batches
- Make multiple jars at once to maintain a steady supply
- Label each jar with the fermentation date for easy tracking
Frequently Asked Questions
What is the cultural significance and history of cultured buttermilk in American keto cuisine?
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.
What are the traditional regional variations of crème fraîche in French cuisine compared to the keto version made on the Serious Keto channel?
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.
How is homemade crème fraîche traditionally served in French cuisine, and how can I use the Serious Keto version in a keto meal?
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.
What occasions or celebrations is cultured buttermilk traditionally associated with in American cooking?
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.
What makes the Serious Keto homemade crème fraîche special compared to store‑bought versions?
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.
What other keto‑friendly dishes pair well with the homemade crème fraîche from Serious Keto?
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.
Why does the Serious Keto recipe use a 24‑hour room‑temperature fermentation instead of a commercial starter culture?
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.
What are the most common mistakes to avoid when making cultured buttermilk and crème fraîche on the Serious Keto channel?
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.
Can I make the Serious Keto cultured buttermilk ahead of time and how should I store it?
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.
What does the YouTube channel Serious Keto specialize in?
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.
Last updated: September 1, 2026
