Mix together the orange juice, half and half (or cream) until combined. Pour halfway into champagne glasses and slowly top each glass with champagne. Add in a splash of the liqueur (about ½ teaspoon per glass).
Garnish with an orange slice.
[color=rgb(130, 130, 130) !important][size=1.4em]NOTES
[color=rgb(3, 3, 3) !important]*Heavy cream or coconut cream can used