In a large pot, heat a little avocado oil and sauté onions and garlic until tender and translucent. Add chopped broccoli and cauliflower with about 1/4 cup water. Season with salt and pepper and let steam covered for about 4-5 min until broccoli is bright green. Veggies can be al dente. Transfer to a high speed blender and blend until creamy. Try not to add additional water unless needed to blend. Transfer back to pot and season again with salt and pepper until liking. Add a bit of water for desired consistency and 2 tablespoons olive oil. Serve with chopped mint.