01 - Preheat the oven to 350°F. Grease and line a 9-inch round cake pan with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
03 - In a large bowl, cream together the butter and sugar until light and fluffy.
04 - Add eggs one at a time, beating well after each addition.
05 - Mix in the ricotta cheese, lemon zest, lemon juice, and vanilla extract until smooth.
06 - Gently fold the dry ingredients into the wet mixture until just combined—do not overmix.
07 - Pour the batter into the prepared pan and smooth the top. Sprinkle sliced almonds evenly over the surface.
08 - Bake for 35–40 minutes, or until a toothpick inserted into the center comes out clean and the top is golden.
09 - Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
10 - Dust with powdered sugar before serving if desired.