Peach Pie Cinnamon Rolls

Brioche:

For the sponge:

(1 envelope) active dry yeast

whole milk, at room temperature

sugar

bread flour (or all-purpose)

For the dough:

bread flour (or AP)

salt

large eggs, lightly beaten

butter, softened, but still cool

Peach Pie Filling:

unsalted butter, at room temperature

brown sugar

ground cinnamon

diced peaches (peeled)

Mascarpone Cinnamon Frosting:

mascarpone cheese, room temperature

powdered sugar

unsalted butter, room temperature

vanilla extract

ground cinnamon