This recipe came from Delish, and was pretty good. While I may not add mushrooms next time, I think it's a pretty good Caesar dressing.
1 hard-cooked egg
2 tablespoons olive oil
1 1/2 tablespoons white wine vinegar
minced garlic, salt and pepper to taste
1/2 teaspoon anchovy paste, optional
Combine ingredients in small food processor. Toss with Romaine, Parmesan cheese and croutons. Add fresh or cooked mushrooms, or maybe even chicken or shrimp, whatever you'd like. This was enough dressing for two large servings.