Preheat your oven to 350°F (180°C) and line a cake pan with parchment paper.
In a large mixing bowl, beat the eggs and sugar together until pale and fluffy.
Add the lemon juice, lemon zest, and heavy cream, then mix until smooth.
In a separate bowl, whisk together the gluten-free flour, baking powder, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix.
Pour the batter into the prepared cake pan and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake cool completely before dusting the top with powdered sugar. Garnish with fresh lemon slices, if desired.
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