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1
Preheat oven to 375 degrees.
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2
Place a chicken breast half, boned side up, between 2 pieces of plastic wrap. Working from the center to the edges, pound lightly with the flat side of a meat mallet to 1/8-inch thickness. Remove plastic wrap. Sprinkle chicken lightly with black pepper. Repeat with remaining chicken.
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3
Firmly squeeze spinach until well drained and practically dry. (I wrap in clean kitchen towel and wring moisture out.) In a small bowl, combine 1/2 of the spinach and egg. (Save remaining chopped spinach for Sauteed Spinach Cream Sauce.)
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4
For each roll, spoon about 2 tablespoons of the spinach mixture onto each chicken piece, spreading evenly over chicken. Top with a slice of prosciutto or . Place a stick of cheese near an edge. Fold in sides; roll up, starting from edge with cheese, into a spiral, pressing the edges to seal. Secure with wooden picks. Place rolls, seam side down, in a 13x9x2-inch (3-quart) baking dish. Drizzle with butter.
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5
Bake, uncovered, in a preheated oven for 35 to 40 minutes or until chicken is no longer pink (170 degrees). Remove toothpicks. Meanwhile, prepare Spinach Cream Sauce.
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6
To serve, slice each chicken roll. Transfer chicken to a dinner plate. Top with cream sauce.
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7
Sauteed Spinach Cream Sauce: In a medium saucepan, melt butter over medium heat. Add garlic and cook 1 minute; add the remaining chopped spinach. Cook and stir for 5 minutes. Add whipping cream, kosher salt and freshly ground black pepper. Cook and stir for 30 seconds or until heated through. Serve over chicken.