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Step 1: Preheat oven to 375°F (190°C).
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Step 2: Cook macaroni according to package instructions.
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Step 3: In a saucepan, melt butter over medium heat.
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Step 4: Add flour and whisk to make a roux, cooking for 1 minute.
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Step 5: Slowly pour in milk, whisking continuously.
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Step 6: Bring the mixture to a simmer and cook until thickened.
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Step 7: Remove from heat and stir in cheddar and mozzarella cheese until melted.
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Step 8: Combine cooked macaroni and cheese sauce.
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Step 9: Transfer the macaroni and cheese to a baking dish.
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Step 10: Top with additional grated cheese if desired.
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Step 11: Bake in the preheated oven for 20-25 minutes, or until golden brown and bubbly.