Place bell peppers on an aluminum foil-lined baking sheet.
Broil 5 inches from heat (with electric oven door partially open) about 5 minutes on each side or until peppers look blistered.
Place peppers in a heavy-duty zip-top plastic bag; seal and let stand 10 minutes to loosen skins. Peel peppers; remove and discard seeds. Cut peppers into quarters.
Melt butter in a large skillet; add roasted pepper and garlic, and saute until garlic is tender. Stir in wine, salt, and pepper. Cook, stirring occasionally, until liquid is reduced by half (5 minutes). Cool slightly.
Process in a blender until smooth.