Brandied Peach Sauce with Pain Perdu & Biscuits

1 (15 ounces) can of diced or sliced peaches in natural juice
1/3 cup granulated sugar
1 tbsp cornstarch
2 tbsp peach brandy, or peach nectar or more juice
1 tsp RumChata
1/2 tsp vanilla extract or 1/4 tsp almond extract
(optional:) a dash of apple pie spice or cinnamon