Line one 12-tin regular muffin pan and one 6-tin regular muffin pan with paper liners.
Spray the liners with cooking spray; set aside.
In a large mixing bowl combine flour, brown sugar, baking powder and salt.
In a medium mixing bowl combine half-and-half or milk, melted butter, maple syrup, sour cream, egg and both extracts.
Whisk until well combined.
Add liquid measure to dry mixture along with the apples.
Stir only until moistened.
Do not overmix.
Fill 18 muffin liners almost full with muffin mixture.
Top with Streusel Topping.
Press the topping ingredients into the tops of the batter slightly so crumbs adhere.
Bake at 425º for 5 minutes.
Reduce heat to 350º and continue baking about 15-19 minutes longer, or until a toothpick inserted in center comes out clean.
Allow muffins to cool in pan for 10 minutes before removing to a wire cooling rack.