1Heat oven to 375°F. Grease large cookie sheet with shortening or cooking spray.
2In medium bowl, stir Bisquick mix, cheese sauce and hot water until soft dough forms; beat vigorously 20 strokes. On surface dusted with Bisquick mix, gently roll dough in Bisquick mix to coat. Shape into ball; knead about 5 times or until smooth. Roll dough into 14-inch round; place on cookie sheet.
3In medium bowl, mix beans and salsa; spread over crust to within 2 inches of edge. Sprinkle with onions. Fold edge over bean mixture. Sprinkle with cheese.
4Bake 25 to 28 minutes or until crust is golden brown and cheese is melted. Garnish with lettuce and tomato.