Heat the oven to 375 degrees. Brush the top, bottom and sides of an 8-inch springform pan with the melted butter.
Whisk together the ricotta, honey and orange zest in a small bowl until combined.
Combine the almond flour, all-purpose flour, baking powder and salt in a small bowl.
In a standing mixer, beat the butter and sugar on medium-high speed until light and fluffy. Add the eggs one by one; lower the mixer speed and stir in the flour mixture until just combined.
Scrape the batter into the prepared pan and spread so that it meets the edges of the pan. Evenly top the outside edge and the middle of cake with tablespoon-sized scoops of the ricotta.
Bake 30-35 minutes. The cake should be golden and the batter around the ricotta lightly firm to the touch. Cool 10 minutes, then release the pan sides and cool the cake completely.
Dust with powdered sugar before serving.
Notes
The cake will keep well refrigerated up to 2 days.