Ingredients
Method
- Mix crumb topping: stir flour, brown sugar, cinnamon, salt, and melted butter with a fork until coarse clumps form.
- Cream butter and sugar with a mixer on medium until pale and fluffy, about 2 minutes.
- Beat in eggs one at a time, then sour cream, lemon zest, lemon juice, and vanilla, mixing until smooth.
- Whisk dry ingredients together, then mix into the wet in two additions, stopping as soon as no dry streaks remain.
- Spread batter in a parchment-lined 8x8-inch metal pan, top with crumb mixture, and bake at 350°F for 35-38 minutes until a toothpick comes out with a few moist crumbs.
- Cool 20 minutes, whisk glaze, drizzle over the cake, let set 10 minutes, then slice.
Notes
Let the cake cool in the pan for 20 minutes before glazing so the drizzle doesn’t melt into the hot crumb. For the cleanest slices, use a serrated knife and wipe it between cuts.
