Preheat your oven to 350°F (180°C). Prepare a cake pan by lining it with parchment paper or greasing and flouring it.
Toast the sunflower seeds in a dry skillet over medium heat until lightly golden and fragrant. Let them cool completely.
In a medium bowl, whisk together the flour, baking powder, and lemon zest.
In a separate bowl, cream together the butter and sugar until light and fluffy. Beat in the eggs one at a time, mixing well after each addition.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk and vanilla extract. Mix until just combined, being careful not to overmix.
Fold in the toasted sunflower seeds. Pour the batter into the prepared cake pan and spread evenly.
Bake for 35-40 minutes, or until a wooden skewer inserted into the center comes out clean. Let the cake cool completely in the pan before inverting onto a wire rack.
Before serving, dust with powdered sugar and garnish with whole or chopped sunflower seeds.
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