Preheat oven to 400°. Spread 2 tablespoons butter over both sides of bread. Place on a baking sheet; bake for about 3 minutes on each side or until lightly toasted. Cut into 1-in. cubes. Reduce heat to 350°.
In a large skillet, saute green pepper, onion and garlic in remaining butter until tender. In a large bowl, lightly beat the eggs. Stir in bread cubes, vegetable mixture, bacon, sugar, salt, oregano and pepper.
Transfer to a greased 11x7-in. baking dish. Cut each tomato into four thick slices; arrange over the top. Sprinkle with cheese. Bake, uncovered, for 30-35 minutes or until a knife inserted in the center comes out clean.