Butternut Squash Apple Soup with nuts

6 cups butternut squash (peeled and cubed into about 1/2-inch pieces) 2 -3 tablespoons butter (can use oil) 2 large leeks , thinly sliced 2 granny smith[...]

1 1/2 cups all-purpose flour 1 cup light brown sugar 1 teaspoon cinnamon 1 teaspoon allspice 1/4 teaspoon salt 2 teaspoons baking powder 1/3 cup walnuts ,[...]