Preheat oven to 350°F. Grease a 9-inch round cake springform pan.
In a small saucepan over low heat, melt ½ cup butter and 1 cup chocolate chips together until smooth. Let cool slightly.
In a large bowl, whisk together ricotta, honey, eggs, and vanilla extract until smooth.
Slowly whisk the cooled chocolate mixture into the ricotta mixture until fully combined.
Stir in oat flour, baking powder, baking soda, and salt until just combined, don’t over mix.
Pour batter into the prepared pan and smooth the top. Bake for 35–45 minutes, or until a toothpick inserted in the center of the cake comes out with just a few moist crumbs. Let cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
In a small saucepan, heat ½ cup heavy cream just until it begins to simmer. Pour over 1 cup chocolate chips in a bowl. Let sit 1–2 minutes, then stir until smooth.
Once the cake is cool, pour ganache over the top and spread evenly. Let set before slicing.