We love a good tuna casserole, and this one topped with cheese biscuits fits the bill perfectly!

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1 medium yellow or white onion, chopped (1/2 cup)
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1 small green sweet pepper, chopped (1/2 cup)
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3 tablespoons butter
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1 10 3/4 ounce can condensed cream of chicken soup
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1 cup milk
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1 9 ounce can tuna, drained and flaked
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2 teaspoons lemon juice
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1 7 3/4 ounce package cheese-garlic or three-cheese complete biscuit mix
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Snipped green onions or chives