Awesome Sweet Potato Casserole

INGREDIENTS

• 1 (8 ounce) can crushed pineapple, drained
• 1/2 (14 ounce) bag flaked coconut, or more to taste
• 3 cups cooked mashed sweet potatoes
• 1 cup white sugar
• 2 eggs
• 1 teaspoon vanilla extract
• 1/3 cup milk
• 1/2 cup butter, melted
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• 1/3 cup all-purpose flour
• 1 cup firmly packed brown sugar
• 1/3 cup butter, melted
• 1 cup finely chopped pecans