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Preheat oven to 350F. Line a baking sheet with parchment.
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Arrange the croissant slices on the baking sheet and drizzle with melted butter. Bake for about 10 minutes, until they are toasted.
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Meanwhile, whisk together eggs, milk, heavy cream, sugar, vanilla, and salt.
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Once the croissants are toasted, place half in a 2-quart baking dish. Sprinkle about ⅔ of the chocolate chips over them and then top with remaining croissant slices. Pour the egg mixture over everything, pressing down gently to make sure everything is covered.
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Cover with aluminum foil and bake for 30 minutes. Uncover, sprinkle the remaining chocolate chips on top and bake until golden brown, 15 - 20 minutes more.
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Let sit for 15 minutes before serving.