Mini frittatas are great when you're entertaining at brunch because they go right into the oven. And they're delicious served warm or at room temperature.
Preheat oven to 350°F. Beat eggs, milk and Seasoning in medium bowl. Add 1/2 cup of the cheese; mix well.
Spray 12 regular-size muffin cups generously with no stick cooking spray. Spoon about 1/4 cup egg mixture into each cup. Sprinkle with tomatoes and remaining 1/2 cup cheese.
Bake 20 minutes or just until eggs are set. Run small knife around each cup to loosen frittatas. Let stand 5 minutes before serving.