Line two 12-tin regular muffin pans with paper liners.
Spray the liners with cooking spray; set aside.
In a large mixing bowl combine gluten free flour, monk fruit sweetener, baking powder, baking soda and salt.
Stir in chocolate chips; set aside.
In a medium mixing bowl combine half-and-half or milk, melted butter, sour cream, egg and vanilla extract.
Whisk until well combined.
Rinse raspberries gently in colander with cold running water.
Drain and pat dry gently between layers of paper towels.
Add liquid measure to dry mixture along with the raspberries.
Stir only until moistened.
Do not overmix.
Fill 20 muffin liners completely full with muffin mixture.
Top with Streusel Topping.
Press the streusel topping ingredients into the tops of the batter slightly so crumbs adhere.
Add chocolate chips on top and press lightly into streusel topping.
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.