Ingredients
For the cake:
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½ cup unsalted butter, softened
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¾ cup sugar
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1 egg
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2 tsp vanilla extract
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2 cups all-purpose flour
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2 tsp baking powder
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½ tsp salt
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½ cup milk
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2 cups fresh or frozen huckleberries (or mix with blueberries if needed)
For the crumble topping:
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½ cup sugar
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⅓ cup all-purpose flour
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½ tsp cinnamon
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¼ cup cold butter, cubed
Instructions
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Preheat oven to 350°F (175°C). Grease a 9-inch square baking dish.
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Make the cake batter: In a bowl, cream together butter and sugar until light and fluffy. Beat in egg and vanilla.
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Combine dry ingredients: In another bowl, whisk flour, baking powder, and salt. Add to the wet mixture alternately with milk. Stir until just combined.
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Fold in berries: Gently stir in huckleberries. Spread batter evenly into the prepared dish.
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Make the topping: Mix sugar, flour, and cinnamon in a small bowl. Cut in cold butter with a fork or fingers until crumbly. Sprinkle over the batter.
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Bake for 40–45 minutes or until the top is golden and a toothpick inserted in the center comes out clean.
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Cool slightly before serving. Great warm or at room temperature.