Melt butter in 12" skillet over medium to medium-high heat.
Saute' onion in butter about 1 minute.
Add squash and garlic and saute' until squash in slightly limp, about 8 minutes.
In a separate bowl stir together cheese, eggs, herbs, salt and pepper.
Add squash/onion mixture to cheese mixture.
Pour into 9" pie plate, which has been buttered or sprayed.
Bake at 375 degrees for 25-30 minutes, or until center is set and edges are lightly browned.