Oatmeal Breakfast Bar

Preheat the oven to 350°F (175°C) and lightly grease a 9-inch square baking pan.

Cream together the shortening and dark brown sugar in a large bowl until light and fluffy, about 2-3 minutes.

Beat in the three eggs one at a time, then add the vanilla extract and mix until well combined.

In a separate bowl, whisk together the whole wheat flour, baking powder, salt, and cinnamon.

Fold the dry ingredients into the wet mixture until just combined, being careful not to overmix.

Stir in the oatmeal, chopped walnuts, and raisins if using, until evenly distributed throughout the batter.

Pour the batter into the prepared baking pan, spreading it evenly with a spatula.

Bake for 22-25 minutes until a toothpick inserted into the center comes out clean or with just a few moist crumbs.

Allow the bars to cool in the pan for 10 minutes, then cut into 4 equal portions and serve warm or at room temperature.