1. Preheat your oven to 375°F and grease a 9×13 baking pan.

2. In a large bowl, mix the warm water, sugar, and yeast. Let this mixture sit until it becomes foamy, about 5-10 minutes. Then, add the flour, salt, and olive oil, stirring until a sticky dough forms. Cover the bowl and let the dough rise for about 30 minutes, or until it has doubled in size.

3. While the dough is rising, melt the butter in a saucepan over medium heat. Add the diced apples, brown sugar, cinnamon, and nutmeg. Cook, stirring occasionally, until the apples have softened and the mixture has become syrupy, about 10-15 minutes.

4. Transfer the risen dough to the prepared baking pan and press it into an even layer, dimpling the surface with your fingers. Spread the apple mixture evenly over the top of the dough, gently pressing it into the nooks and crannies.

5. Place the pan in the preheated oven and bake for 25-30 minutes, or until the Apple Fritter Focaccia Bread is golden brown and fluffy.

6. While the bread is baking, whisk together the powdered sugar, milk, and vanilla extract to create a smooth glaze. Once the Apple Fritter Focaccia Bread has cooled slightly, drizzle the glaze over the top, allowing it to soak into the dimples and crevices.