Heat oven to 400°F. In large saucepan, heat 1 inch water to boiling. Add broccoli and cauliflower. Cover; cook 3 to 5 minutes or until tender. Drain and return to saucepan. Add lemon juice and mayonnaise; toss to coat. Season with salt and pepper.
Separate dough into 4 rectangles; press slightly to flatten and firmly press perforations to seal. Place 1 rectangle in each of 4 (4-inch) tart pans; press dough in bottom and up side of pan to form crust. Spoon vegetable mixture into crusts. Sprinkle each with 1/4 cup Monterey Jack cheese and 2 tablespoons Parmesan cheese.
Place tart pans on cookie sheet. Bake 15 to 20 minutes or until cheese is melted and light golden brown around edges.