Preheat oven to 350. Line 12 jumbo muffin tins,with foil or paper liners
MAKE STREUSEL TOPPING
Combine all STREUSEL ingredients in a bowl and mix until crumbly, set aside
MAKE MUFFIND
In a medium bowl combine flour, baking powder, baking soda, salt and cinnamon
In a large bowl beat butter and sugar until.light and fluffy, add eggs and vanilla and beat in
Alternate flour and sour cream to butter mixture, mixing with a spoon until blended
Add rasberries, blueberries and white chocolate chips. Gently fold in
Spoon batter evenly into muffin cups. Batter is very thick, it's supposed to be so don't add any liquid!
Divide Strusel evenly on top of muffin batter
Bake 20 to 25 minutes until a toothpick comes out just clean.
Cool in pans 15 minutes then remove to wire racks
