Preheat oven to 350 F
Oil and add a parchment round to four, 4-inch cake pans
Stir together ingredients and refrigerate until ready to use
Combine the flour, sugar, baking powder and salt, set aside
Mix together the greek yogurt, oil, eggs, lemon juice and lemon zest
Add the wet ingredients to the dry and stir to combine
Evenly distribute the batter between the prepared cake pans
Top them with the crumb topping
Bake for 25-30 minutes, until toothpick inserted in center comes out clean
Cool completely
Mix together the powdered sugar and lemon juice
Drizzle over cool cakes
