Simple Lemon Cake

Name: Simple Lemon Cake
Ingredients: ½ cup unsalted butter (1 stick), room temperature, plus more for pan; 1 ½ cups all-purpose flour (spooned and leveled), plus more for pan; ½ pound lemons (about 2), ends removed, cut crosswise into thin slices, and seeds removed; Coarse salt; ¼ cup fresh lemon juice (from 1 lemon); 1 ½ teaspoons baking powder; ½ teaspoon baking soda; 1 cup granulated sugar; 2 large eggs; ½ cup buttermilk; 1 teaspoon pure vanilla extract; Confectioners' sugar, for dusting; Raspberries and whipped cream (optional), for serving