Place the cranberries, sugar, and water into a small saucepan.
Bring the mixture to a gentle simmer over medium heat, allowing the cranberries to burst and release their juice, while you smell the sweet-tart aroma filling the air.
Reduce the heat and let it simmer for about 10 minutes, pressing the cranberries gently with the back of a spoon to help release more juice and deepen the color.
Pour the syrup through a fine sieve into a bowl, pressing gently to extract as much liquid as possible, then discard the solids and let the syrup cool.
Once cooled, fill each champagne flute halfway with chilled champagne.
Top each glass with a generous splash of the cranberry syrup, adjusting to your preferred level of tartness and sweetness.
Garnish with a twist of orange peel or a few fresh cranberries for a colorful and aromatic finishing touch.
Serve immediately to enjoy the lively bubbles and bright, tart flavor of your Cranberry Mimosa.