01 - Preheat the oven to 350°F. Grease a 9-inch round cake pan and line with parchment paper.
02 - Whisk together the flour, baking powder, and salt in a medium bowl. Set aside.
03 - Beat the butter and sugar in a large bowl until light and fluffy, about 2-3 minutes.
04 - Mix in the ricotta cheese until fully incorporated and smooth.
05 - Add eggs one at a time, beating thoroughly after each addition.
06 - Blend in the lemon zest, lemon juice, and vanilla extract.
07 - Gently fold the dry ingredients into the wet mixture until just combined. Avoid overmixing.
08 - Pour the batter into the prepared pan and smooth the top surface evenly.
09 - Sprinkle sliced almonds evenly over the batter. Add additional sugar if desired for extra crispiness.
10 - Bake for 40-45 minutes until a toothpick inserted in the center comes out clean and top is golden brown.
11 - Let cool in the pan for 15 minutes, then transfer to a wire rack to cool completely before slicing.