1 bolillo (4 inch), cut lengthwise in half
2 Tbsp. KRAFT Real Mayo Mayonnaise
1/2 cup refried beans
1/4 cup salsa
2 KRAFT Singles, cut into quarters
Place bread, cut-sides up, on microwaveable plate; spread both halves with mayo, then beans and salsa. Top with Singles. Microwave on HIGH 1 min. 20 sec. or until Singles are melted. Cut each bread piece in half.