01 - Preheat oven to 350°F. Grease a 9-inch round cake pan and line with parchment paper.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl. Set aside.
03 - Beat butter and sugar in a large bowl until light and fluffy.
04 - Add eggs one at a time, beating well after each addition.
05 - Mix in 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 batter into prepared pan, smooth top, and sprinkle with sliced almonds. Bake for 35-40 minutes until a toothpick inserted into center comes out clean and top is golden.
08 - Cool cake in pan for 10 minutes, then transfer to wire rack to cool completely. Dust with powdered sugar before serving if desired.