In a large skillet, saute onions in 1/4 cup butter until softened. Add 3 bay leaves, 1 sage sprig and 1 thyme sprig. Reduce heat to medium-low; cook, stirring occasionally, for 30-40 minutes or until onions are deep golden brown. Add garlic; cook 2 minutes longer. Discard bay leaves, thyme and sage. Cool slightly.
Place onion mixture in a food processor; cover and process until blended. Transfer to a small saucepan. Add the vinegar, brown sugar, molasses and remaining bay leaves, sage, thyme and butter. Bring to a boil; cook and stir until thickened, about 10 minutes. Discard bay leaves, sage and thyme.
Unfold puff pastry; cut into 1-1/2-in. squares. Transfer squares to greased baking sheets. Dollop a scant teaspoonful of onion jam in the middle of each square; sprinkle with 1/2 teaspoon cheese.
Bake at 400° for 10-15 minutes or until golden brown. Serve warm or at room temperature. Yield: 6 dozen.