Heat a large skillet and 1 tablespoon of butter over medium heat. Once hot, add raw shrimp and garlic. Stir. Sprinkle shrimp with chili powder and cayenne pepper. Continue to cook, stirring occasionally, until shrimp are no longer transparent and are golden on the outside, approximately 3 minutes each side.
Prepare the salad bowls. Divide lettuce, avocado, cucumber, carrots and edamame between your bowls (2 bowls for very large salads, or 4 bowls for lighter salads). Top with fresh cilantro and peanuts and last, the prepared shrimp.
Prepare the salad dressing- Place all of the salad dressing ingredients in the bowl of a food processor or high powered blender and process until smooth and creamy. Taste and add any additions you feel necessary (lime juice, agave, salt).
Pour the miso dressing over the salad, toss and serve immediately.