Beat first 6 ingredients at medium speed with an electric mixer 2 to 3 minutes or until well blended.
Melt butter in a 12-inch ovenproof skillet; add egg mixture.
Bake at 350º for 15 minutes. Remove from oven; sprinkle with tomatoes, cheese, and basil. Return to oven, and bake 15 to 20 more minutes or until set. Garnish, if desired; serve immediately.
Note: Farmer cheese is a mild, part-skim, semisoft cheese available in 8-ounce rounds. Havarti or Monterey Jack cheese may be substituted.
Spinach, Cheddar, and Bacon Omelet: Substitute 1 (10-ounce) package frozen, thawed, and well-drained chopped spinach for thyme. Omit farmer cheese and fresh basil. Top with 8 ounces shredded Cheddar cheese and 1/2 cup cooked, crumbled bacon.
Just made this for a crowd for New Year's Day brunch, and it was a hit. It was so easy to assemble. I had to use havarti because I couldn't find farmer cheese. I also used canned diced tomatoes (drained) rather than plum because tomatoes aren't good this time of year. Although it was great as is, this is also a good base recipe for plenty of variations.
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