Place Tupperwave Stack Cooker Colander in 1¾-Qt./1.75 L Casserole. Place beef, onion and DIY Southwest Chipotle in Stack Cooker Colander.
Cover and microwave on high power 5-6 minutes, or until cooked, stirring halfway through.
Add tomatoes to ground beef and stir.
Prep the Zucchini
Half zucchinis lengthwise and remove seeds with a spoon.
Sprinkle each half with salt. Place zucchinis in Stack Cooker 3-Qt./3 L Casserole and in the inverted 3/4-Qt./750 mL Casserole/Cover.
Spoon beef mixture over each zucchini boat and top with cheese. Stack inverted 3/4-Qt./750 mL Casserole/Cover above 3-Qt./3 L Casserole and microwave on high power 5-8 minutes or until cheese is melted and zucchinis have softened slightly.
