Combine rosé, gin, cranberry juice, simple syrup, and cranberry bitters in an ice filled cocktail shaker. Shake vigorously for at least 15 seconds.
Strain in to an ice filled cocktail glass and op with tonic. Garnish with fresh thyme and skewered cranberries.
For the thyme simple syrup:
Combine water and sugar in a small saucepan set over medium heat. Swirl pan until sugar dissolves. Remove from heat and add thyme. Allow to steep at least 20 minutes. Strain and store in refrigerator