Preheat oven to 350°F.
Grease your bundt pan very well—gluten-free cakes are more delicate and tend to stick.
In a bowl, combine the sugar + lemon zest, and Rub it together with your fingers until fragrant.
Whisk together flour, baking powder, and salt
In a separate bowl, whisk together sour cream, melted butter, eggs, oil, lemon juice, lemon extract and vanilla.
Gradually add dry ingredients to wet, and Mix until just combined.
The batter will be slightly thick and a little lumpy—that’s exactly what you want.
Pour into prepared bundt pan and Bake at 350°F for 45–55 minutes, or until a toothpick comes out clean.
Let cool in the pan for 10–15 minutes, then carefully invert onto a wire rack.
Make the Glaze:
Combine powdered sugar and lemon juice until it makes a thick glaze, then pour over cooled cake.