In a large bowl, combine flour, salt, yeast, and water. Mix until a sticky dough forms. Cover with plastic wrap and let rest at room temperature for 8 hours or overnight.

Peel, core, and dice the apples. Mix apples with sugar and cinnamon until coated.

Add the apples to the dough, knead gently to incorporate, and place into a greased 5-quart French oven. Cover and let rise for about 2 hours until puffy.

Preheat the oven with the French oven inside to 425°F. Bake the bread covered for 40-45 minutes. Remove lid and bake for another 10-15 minutes until golden brown. Cool on a rack.

Mix melted butter, brown sugar, and maple syrup until well blended. Spread on slices before serving.