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PLACE blueberries into a medium saucepan.
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ADD 2 tablespoons lemon juice, 1/2 teaspoon grated lemon zest, and 1 teaspoon fresh thyme leaves.
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BRING to a boil over medium-high heat.
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REDUCE heat to medium and simmer, while STIRRING occasionally, about 20 minutes or until thickened.
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ALLOW blueberries to cool for 15 minutes.
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PREHEAT large skillet over high heat.
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PREHEAT oven to 375°F.
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BUTTER 1 side of each bread slice.
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PLACE bread, butter side down, onto hot skillet.
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COOK bread slices 1-2 minutes or until bottom is toasted golden brown. DO NOT turn bread over.
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TRANSFER bread slices, cooked side down, to an ungreased cookie sheet.
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SPREAD a thin layer of mascarpone cheese over each slice.
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TOP each slice with about 2 tablespoons blueberry spread.
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DIVIDE Brie evenly between bread slices and PLACE on top of blueberry spread.
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BAKE sandwiches in oven about 10 minutes or until cheese is melted.
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TRANSFER sandwiches to serving plates.
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DRIZZLE 1 teaspoon honey over each sandwich.
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TOP each sandwich with about 1/4 cup arugula.
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SERVE immediately.