Blackberry-Thyme Crumb Cake

Ingredients

For the Topping

• 1/2 cup (about 4 ounces) packed light brown sugar
• 1 tablespoon grated lemon zest from about 1 lemon
• 1/2 cup (about 2 1/2 ounces) all-purpose flour
• 3 tablespoons unsalted butter, chilled and cut into small pieces
• 1/2 cup toasted walnuts, coarsely chopped
• 4 teaspoons fresh thyme leaves, plus additional for garnish

For the Cake

• Baking spray
• 2 cups (about 10 ounces) all-purpose flour
• 1 cup (about 7 ounces) granulated sugar
• 1 teaspoon baking soda
• 1 teaspoon salt
• 6 ounces unsalted butter, at room temperature
• 2 large eggs, at room temperature
• 1 cup (8 ounces) buttermilk, at room temperature
• 2 tablespoons lemon juice from about 1 lemon
• 2 teaspoons pure vanilla extract
• 1 cup (about 12 ounces) blackberry preserves

Preparation

Click here for preparation method.