Step 1

Preheat broiler. Mix the first 4 ingredients; toss with coleslaw mix and green onions. Refrigerate until serving.

Step 2

Place beans in a small saucepan; mash with a potato masher until smooth. Cook over low heat until heated through, about 10 minutes, stirring frequently.

Step 3

Meanwhile, in another saucepan, mix chicken and barbecue sauce; cook over medium-low heat until heated through, about 10 minutes, stirring occasionally.

Step 4

To assemble, place tostada shells on ungreased baking sheets. Spread with beans; top with chicken mixture and cheese. Broil 3-4 in. from heat until tostada shells are lightly browned and cheese is melted, 1-2 minutes. Top with slaw. Serve immediately.