Preheat oven to 400 degrees. Place sliced baguette on baking sheet and drizzle with olive oil. Bake for 10 minutes. Remove from oven and set aside.
In medium sized mixing bowl add all of the herbed goat cheese ingredients. Beat on medium speed with a mixer until all ingredients are incorporated and mixture is smooth.
Spread cheese mixture on top of cooled toasted baguette slices. Layer radishes on top of cheese.
To garnish right before serving top radishes with additional lemon zest, a small sprinkling of flaked sea salt, fennel fronds and a light drizzle of olive oil.
Flaked sea salt will proved a textural interest to the crostini as well as a needed salt element that will not dissolve as other salts do