Preheat oven to 325°F (170°C). Spray an 8-inch round cake pan with baking spray with flour. Line bottom of pan with parchment paper.
In a medium bowl, whisk together flour, baking powder, and salt.
In a large bowl, whisk together granulated sugar and orange zest until mixture resembles wet sand. Whisk in ricotta, oil, eggs, and vanilla. Stir in flour mixture just until dry ingredients are moistened. Stir in three-fourths of cherries (about 210 grams) until combined and no flour pockets remain. Spread into prepared pan. Top with remaining cherries.
Bake until edges are golden brown and a wooden pick inserted in center comes out with a fewmoist crumbs, 55 minutes to 1 hour and 5 minutes. Let cool in pan on a wire rack for 10 minutes.Remove from pan, and let cool completely on a wire rack.
Serve with Orange Whipped Ricotta. Garnish with confectioners’ sugar, if desired. Refrigerate in an airtight container for up to 3 days.