Preheat oven to 300.
To par cook the crostinis, place the sliced Ciabatta on a baking pan lined with parchment paper. Bake until almost crispy, about 10 minutes. Allow to cool completely at room temperature.
Heat the oil in a large skillet over medium heat. Add the sausage and spices and stir frequently until half-way cooked, about 3-4 minutes. Drain and set aside to cool at room temperature.
Divide the partially cooked sausage among the crostinis, about 2-3 tablespoon each. Divide the mascarpone among the top of the sausage. Return to a baking pan lined with parchment paper and finish in the oven until sausage is cooked and cheese is melted, about 8-10 minutes.