Preheat broiler. Whisk eggs, milk and cumin in a medium bowl; set aside.
Melt butter in a large cast iron or oven-safe skillet over medium heat. Add frozen vegetables and cook 4-5 minutes or until vegetables are tender, stirring occasionally.
Broil 4-5” from heat 1-2 minutes or just until top is set and cheese is melted. Cut into 6 wedges.