Isn’t that why sour cream was invented?
When I lived in Louisiana I watched a couple of ladies, I worked with, make home made mayo for a potato salad in our office kitchen using just the yolks from hard boiled eggs, oil and some spices and lemon juice. That was the best potato salad I have had. Wish I had watched the whole process but they were whisking by hand and I could not stay around for all the ingredients they put in.