Turn the slow cooker to High and allow it to preheat. Line the slow cooker insert with parchment paper and close the lid.
In a stand mixer bowl combine the lukewarm water, active dry yeast, and sugar. Let the mixture rest for about 10 minutes until the yeast activates and the mixture begins to rise.
Add the salt, all-purpose flour, and Parmesan cheese to the mixer. Mix with the dough hook until the dough is well incorporated and the sides of the bowl are clean.
Transfer the ball of dough to a lightly floured surface and knead just a few times until smooth. Shape the dough into a ball and place it into the preheated slow cooker on the parchment; close the lid.
Bake on High in the slow cooker for 120 minutes, checking occasionally.
Preheat the oven to 450℉. When the slow cooker time is complete, lift the bread on the parchment onto a baking sheet and place in the oven for about 10 to 15 minutes to brown the top.