Beat eggs and milk in a large mixing bowl until combined. Stir in Prairie Farms Sour Cream and cheddar cheese and salt and pepper.
Melt 2 tbsp butter in a cast iron skillet. Heat oven to 350 degrees F.
Heat broccoli, spinach and peppers in the skillet until just soft. Remove from heat and pour egg mixture over vegetables in the cast iron skillet. Top with cherry tomatoes.
Bake for 15-20 minutes until egg is solid in the middle.
Remove from oven and let cool. Slice frittata and serve.