Mix together the finely chopped mushrooms, sour cream, mayo, and spices. Fold in the green beans. Spread in an 8 x 8 baking dish.
Mix the topping ingredients. Sprinkle over the green beans.
Bake for 25-30 minutes until hot, bubbly, and the topping is golden brown.
Nutrition - This makes 12 servings. A serving is approximately ½ a cup. There are 4.8 NET carbs per serving.Prep - This is a great make-ahead side dish! To make this ahead of time bake the green beans in the sauce without the topping. Cool and refrigerate. When you are ready to serve just add the topping and bake again until the green beans are hot.Green Beans - Use frozen. This saves time on having to steam fresh string beans. If your green beans are very long cut them into bite-sized pieces.Mushrooms - Use frozen mushrooms. Mushrooms are not a vegetable that freezes well but they are much easier to finely chop (without making mushroom mush) when they are frozen. Simply pop your white button mushrooms in the freezer the day before making this. Then finely chop them in the food processor.