In a small saucepan, combine water and butter. On medium, heat until butter is melted.
In a large mixing bowl, add 1 cup of the flour, yeast, sugar, and salt. Add water mixture and blend together. Add in the cinnamon, nutmeg, maple and egg. Mix until well combined.
Add remaining 1 cup of flour and beat for about 2 minutes, scraping sides of bowl as needed.
Pour dough into a greased 8x8-inch baking pan. Cover with a clean, dry towel and let rise in a warm place until doubled in size (about 45 minutes).
While dough is rising, combine streusel ingredients with a pastry blender or your hands, until very crumbly. Set aside.
When dough is ready, sprinkle streusel evenly over the top. Bake in a preheated 350 degree F oven for about 35 minutes, until golden brown. Cool slightly on wire rack.
While cooling, prepare glaze. Whisk together the powdered sugar, milk and maple until smooth. Drizzle over warm cake. Slice and enjoy!