for the muffins:
1 and 1/2 c all-purpose flour
1/2 c packed light brown sugar
2 tsp baking powder
1 and 1/2 tsp ground cinnamon
1/4 tsp baking soda
1/4 tsp salt
3/4 c milk
1 and 1/2 tsp vanilla extract
1/3 c vegetable or canola oil
2 large eggs
for the crumb topping:
1/3 c granulated sugar
1/3 c packed light brown sugar
1 tsp ground cinnamon
1/4 tsp salt
1/2 c unsalted butter, melted, cooled slightly
1 and 1/2 c all-purpose flour