Prep Time: 10 mins
Cook Time: 55 mins
Total Time: 1 hr 5 mins
INGREDIENTS
TOPPING
- 4 tablespoons unsalted butter cubed and chilled
- 1/3 cup sugar
- 1/3 cup flour
- 1/3 cup oats
BATTER
- 6 tablespoons unsalted butter at room temperature
- 1 cup sugar
- 1 tablespoon key lime zest
- 1 1/2 cups all purpose flour
- 1 teaspoon baking powder
- 1/4 teaspoon baking soda
- 1/2 teaspoon salt
- 2 large eggs at room temperature
- 1/2 cup full fat Greek yogurt at room temperature
- 3 cups blueberries fresh or frozen
KEY LIME SYRUP
- 1/3 cup sugar
- 1/2 cup key lime juice *regular limes can be used instead12 -16 key limes
INSTRUCTIONS
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Pre-heat oven to 350°
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Butter a 9-inch (23cm) square cake pan.
TOPPING
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Mix very cold butter, sugar, flour and oats with your hands until all is well mixed with peas size crumbs. Set in Refrigerator until needed
BATTER
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Cream butter, sugar and key lime zest together until light and creamy, about 3 minutes. (by hand with a wooden spoon or using an electric mixer)
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Add the eggs one at a time, fully incorporating. Make sure to scrape down the sides of the bowl
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Mix together the flour, baking powder, baking soda and salt in medium-sized bowl.
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Add half the flour mixture to the creamed, mixing just enough to incorporate
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Add Greek yogurt, mixing in just enough to incorporate
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Add the remaining flour mixture, mixing just enough so it’s barely incorporated (there will still be dry bits of unincorporated flour)
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Using a flexible spatula, gently fold in the blueberries into the mixture. Being careful not to overmix allowing the blueberries to stain the batter.
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Scrape the batter into the prepared baking pan and smooth the top.
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Add the topping over the blueberry batter and bake for 55-60 minutes at 350 degrees.
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Or until the buckle is lightly browned on top and feels just set in the center. It should spring back lightly when you touch the center.
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When the buckle is almost finished baking, make the syrup by heating the key lime juice and sugar in a small saucepan over medium heat, cooking it until it thickens. It should take about 5 minutes. Don’t allow the syrup to brown.
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Remove the buckle from the oven and pour the warm key lime syrup over it, letting it soak in.
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Serve buckle slightly warm or at room temperature with vanilla ice cream or home made whipped cream.