Step 1

Preheat oven to 350°F. Butter and flour** a 9"x 13"x 2" baking pan.

Step 2

Place the pineapple and blueberries in the pan in a single layer. Sprinkle with sugar and drizzle the vanilla over the top. Gently shake the pan to combine.

Step 3

Whisk together the flour, sugar, baking powder, baking soda, cinnamon, and salt.

Step 4

Sprinkle the topping mixture over the fruit. Gently shake the pan to combine.

Step 5

Place the cubed butter evenly over the top. Sprinkle the nuts over the top.

Step 6

Bake 40 to 45 minutes, or until the cake is golden brown and set. The top should spring back with touched.