Preheat oven to 350º F.
Line 8x8 pan with parchment paper, set aside.
Cream the sugar and butter togther.
Add egg and vanilla, mix until combined.
In medium bowl add the flour, baking powder, and salt. Stir to combine.
Add flour mixture to butter mixture and mix on low and alternate with almond milk. Mix just until combined.
To make the crumble, combine all ingredients (except the pecans) in a small saucepan. Mix until mixture resembles very wet sand.
Pour half the batter into the pan and spread evenly, then sprinkle half the crumble mixture over the batter. You can use a spoon or your fingers.
Pour remaining batter on over top of crumble layer and spread evenly.
Pour the pecans into the remaining crumble mixture and mix well. Sprinkle over the top of the batter.
Bake for 25-30 mnutes, then let cool for 20 minutes.
In a small saucepan, mix the Dulce de Leche and milk over low heat until your Dulce de Leche is pourable. Add more milk if needed, but only in small quantites until desired consistency is achieved.
Drizzle over coffee cake and serve.