Chill your champagne flutes in the freezer for at least 15 minutes to keep the drink icy and festive.
In a small pitcher, combine the freshly squeezed orange juice with the cranberry juice concentrate and stir well until fully blended. This mixture should be vibrant and fragrant, with a hint of tartness.
Fill each chilled glass halfway with the orange and cranberry juice mixture, allowing the liquid to swirl and catch the light with a bright, ruby hue.
Add a few fresh cranberries into each glass, letting them float on the surface for a pop of color and texture.
Gently top each glass with chilled sparkling wine, pouring slowly to preserve the bubbles and create a lively, fizzy effect.
Garnish each drink with a sprig of thyme and a few extra cranberries for a festive look and aromatic touch.
Serve immediately while the bubbles are lively, and enjoy the sparkling, tart celebration in your glass.