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In a large skillet, cook beef and onion until meat is no longer pink; drain. Stir in taco seasoning and olives; set aside to cool. Add eggs and cheese.
Unroll crescent roll dough and separate into triangles. Place triangles on an ungreased baking sheet. Place 2 tablespoons meat mixture onto each triangle. Roll and shape into crescents. Bake at 375° for 10-15 minutes or until lightly browned.