To make the crumb topping: combine sugars, cinnamon and salt in a medium bowl. Whisk in melted butter and add flour.
To make the muffins: Preheat oven to 350.
Place paper liners in a regular sized muffin.
In a large bowl, beat the eggs, brown sugar, granulated sugar, applesauce, pumpkin until smooth.
In a separate bowl, combine the flour, baking soda, baking powder, pumpkin pie spice and salt until combined.
Add the flour mixture to the pumpkin mixture and mix well.
Fill paper-lined muffin cups three-fourths of the way full.
Top the muffin batter with the crumble topping until they're overflowing.
Bake the muffins for 20 minutes. .
To make the drizzle: In a medium saucepan over medium-high heat, melt the butter.
Cook for about 3 minutes until butter starts to melt.
Remove from heat.
Add the powdered sugar, vanilla, maple syrup and water and stir.
Using a spoon, drizzle over baked muffins.