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Preheat the oven to 350°F (325°F if using a glass or dark metal pan). Grease an 8” square or 9” round pan.
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To make the brownies: Whisk together the melted butter or oil, water, and eggs. Add the mix and stir until well combined.
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Mix in the pecans and chips, then spread the batter in the prepared pan, smoothing the top.
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Bake the brownies for 35 to 40 minutes (40 to 45 minutes in a glass pan), until a toothpick or paring knife inserted in the center comes out with a few moist crumbs clinging to it.
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To make the topping: While the brownies are baking, melt the caramel with the cream in a small saucepan over low heat, or in the microwave. Stir until the mixture is smooth; set aside.
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When the brownies come out of the oven, immediately sprinkle 1 1/2 cups (65g) of the marshmallows on top. Wait 3 to 5 minutes, until they soften, and spread to cover the top (a small offset spatula works well here).
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Sprinkle with the remaining marshmallows, pecans, and chocolate chips.
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Drizzle the brownies with the melted caramel before serving.
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Store any leftover brownies, well wrapped, at room temperature for a few days; freeze for longer storage.