Preheat your oven to 350°F (175°C). This ensures a perfectly baked bar with a nice golden crust.
Grease your 9x13 inch baking pan with a bit of coconut oil or line it with parchment paper for easy removal of the bars after baking.
In a large mixing bowl, whisk together the white whole-wheat flour, brown coconut palm sugar, old-fashioned rolled oats, cinnamon, baking soda, and salt. Make sure everything is well combined.
In a separate bowl, combine the water, chopped medjool dates, vanilla extract, and solid coconut oil. Mix until well blended. The warmth from the water will help soften the dates and coconut oil.
Pour the wet mixture into the dry ingredients and stir until everything is combined. The batter will be somewhat thick, which is ideal for bars.
Transfer the mixture into your prepared baking pan, smoothing it out with a spatula to ensure an even layer.
Bake in the preheated oven for 25-30 minutes, or until the edges are slightly golden and a toothpick inserted in the center comes out clean.
Allow the bars to cool in the pan for about 10 minutes before transferring them to a wire rack to cool completely. Once cooled, cut them into squares or rectangles.