Healthier Dark Chocolate Chunk Oatmeal Cookie Bars

Name: Healthier Dark Chocolate Chunk Oatmeal Cookie Bars
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: American
Ingredients: 2 1/2 cups old fashioned oats; 1 cup all-purpose flour; 1 cup white whole wheat or whole wheat pastry flour; 1/2-3/4 cup light brown sugar, us more for a sweeter cookie ((I use only 1/2 cup)); 1/4-1/2 cup granulated sugar, us more for a sweeter cookie ((I use only 1/4 cup)); 1 teaspoon baking soda; 1/2 teaspoon kosher salt; 1 cup melted coconut oil ((see notes)); 2 large eggs; 1 tablespoon vanilla extract; 1 1/2 cups dark chocolate chunks