Prep the pan & oven – Preheat oven to 350°F (175°C). Grease and lightly flour a 9-inch springform pan, or line the bottom with parchment paper.
Mix dry ingredients – In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
Beat wet ingredients – In a large mixing bowl, beat the butter, ricotta and sugar together until smooth and creamy, about 2 minutes. Add the eggs, one at a time, mixing well after each.
Add flavor – Mix in lemon zest, lemon juice, and vanilla until fully combined.
Combine – Gently fold the dry ingredients into the wet mixture until just incorporated. Do not overmix.
Bake – Pour batter into the prepared pan and smooth the top. Bake for 40–45 minutes, or until the cake is golden on top and a toothpick inserted in the center comes out clean.
Cool & finish – Let the cake cool in the pan for 10 minutes, then release the springform sides. Cool completely on a wire rack. Dust with powdered sugar before serving.