Preheat the oven to 350°F (175°C). Line an 8x8-inch baking pan with parchment paper and lightly spray or grease the pan.
In a large mixing bowl, combine the rolled oats, flour, brown sugar, sea salt, baking powder, and ground cinnamon; stir until evenly mixed.
Add the melted butter, vanilla extract, shredded zucchini, and raisins to the dry ingredients and mix until everything is evenly incorporated.
Transfer the mixture to the prepared pan and press it firmly and evenly into the pan with a spatula or your hands.
Bake for about 25 minutes, or until the edges are lightly golden and the center is set.
Allow the bars to cool completely in the pan before lifting out on the parchment and cutting into 16 bars.