Black Berry Muffins with Crumble Topping

2 cups flour
2 tsp baking powder
1/2 tsp baking soda
1/2 tsp salt
1/2 cup sugar
2 eggs
1 cup vanilla or plain yogurt
1/2 cup canola oil
1 tsp vanilla
1 cup frozen blackberries

Crumble topping:
1/4 cup flour
1/4 cup brown sugar
2 Tbsp oats
1 tsp cinnamon
1/4 tsp nutmeg
3 Tbsp butter

Preheat oven to 375. Grease or line muffin tins.

In a medium sized bowl stir together flour, baking powder and soda and salt. Set aside.

Prepare crumble topping in a small bowl by combining dry ingredients and then crumbling butter into the mix with your fingers until everything is crumbly. Set aside.

In a large bowl, beat together sugar and eggs until creamy. Add yogurt, oil and vanilla and mix well. Add flour mixture and stir until blended. Gently fold in blackberries until evenly distributed through the batter.

Add batter to prepared tin, filling them 3/4 full. Sprinkle topping on each muffin and bake until a toothpick inserted in the center comes out dry,about 20 minutes or so.