Preheat oven to 350°F and line a 9x13 baking pan with parchment paper.
In a large mixing bowl add oats, rice cereal, oat flour, brown sugar, baking soda, salt, and mini chocolate chips, if using and stir to combine.
In a measuring cup melt 1/3 cup of coconut oil then add in honey and vanilla and pour over oat mixture, stir until all ingredients are mixed evenly.
Using a spatula, transfer granola mixture to prepared baking dish and pat down in an even layer. Use a large measuring cup with a flat bottom to get your bars smooth on the surface.
Place oats in preheated oven for 22-25 minutes.
After baking, allow granola to cool for 15 minutes before removing from pan.
Allow an additional 5 minutes before cutting into squares or bars. This will help the granola bars to stay together better.