01 - Preheat oven to 350°F. Grease a 9-inch round cake pan and line bottom with parchment paper.
02 - Whisk together flour, baking powder, and salt in a medium bowl. Set aside.
03 - Combine granulated sugar and lemon zest in a large bowl. Rub together with fingers until fragrant.
04 - Add softened butter to sugar mixture. Beat until light and fluffy.
05 - Add eggs one at a time, beating well after each addition.
06 - Mix in ricotta cheese, lemon juice, and vanilla extract until smooth.
07 - Gently fold dry ingredients into wet mixture until just combined. Avoid overmixing.
08 - Pour batter into prepared pan and smooth top evenly.
09 - Sprinkle sliced almonds and 2 tablespoons sugar over surface.
10 - Bake for 38-42 minutes until toothpick inserted in center comes out clean and top is golden.
11 - Cool in pan for 10 minutes, then remove and cool completely on wire rack.
12 - Dust with powdered sugar before serving if desired.