Salmon Casserole

1 - 15 ounce can of salmon, drained and flaked
4 eggs
5 zucchini, sliced in 1/8" widths
2 cups shredded cheddar cheese
1 3/4 cup Bisquick
1 1/4 cup onion, chopped
2/3 cup vegetable oil
1 1/2 teaspoons dried oregano leaves
1 teaspoon salt
1/2 teaspoon pepper (or to taste)

Beat eggs. Grease a 9x13 dish. Mix everything except zucchini in a bowl. Add zucchini and lightly mix in. Pour mixture into pan and bake uncovered for about 45 minutes at 375 degrees.