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Melt the chocolate (3/4 cup) gently in the microwave or over a pot of simmering water (bain marie). Set aside to cool.
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Sift all of your dry ingredients together in a bowl and stir together.
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Beat the butter and sugar together until thick and creamy.
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Beat in your eggs one by one.
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Add in your cooled melted chocolate and vanilla extract. Continue beating until your ingredients are well mixed.
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To this mix, fold in your dry ingredients and the chocolate chips (2 1/4 cups) and mix until combined.
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Scoop your cookie with a 1 tablespoon scoop (if the mix is soft you can pop it in the fridge to stiffen up and this will make it easier to scoop).
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Bake at 350°F/180°C for 8 - 9 minutes. Take care not to over bake as you want these cookies to be almost brownie-like.
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Once baked, pop a marshmallow on top and put it back in the oven on broil for 1-2 minutes for a lovely toasted effect.