Place gin, blueberry simple syrup and lemon juice in a cocktail shaker with ice. Cover and shake vigorously. Strain into a champagne flute. Top with champagne and garnish with lemon peel twist and fresh blueberries.
I made my fresh blueberry juice with 1 cup blueberries, 1/2 cup sugar and 1/2 cup water in a saucepan. Bring to boil on the stove, reduce heat and simmer until you can smash blueberries with a fork. Strain into a mason jar, cover and refrigerate.