Preheat oven to 425° F. Using a paper towel, lightly coat 4 (4-6oz.) ramekins with coconut oil (you can also lightly spray with cooking spray). Place the ramekins on a small baking pan and set aside.
In a microwave bowl (I like to use my 2 cup Pyrex for this as everything will fit in it), combine coconut oil and chocolate and heat in 30 second intervals until chocolate and coconut are melted. This may take 1 - 1½ minutes.
Using a small whisk or spoon, add powdered sugar and mix until the clumps are gone.
Add 2 whole eggs and 2 egg yolks, combing well. Add gluten free flour blend and guar gum (omit if your flour blend contains xanthan gum). Stir well until the batter is smooth.
Evenly distribute the batter between the 4 ramekins. There should be about ½ cup of batter per ramekin.
Bake for 13 minutes. The cakes will come out firm around the edges and slightly wobbly in the center. Remove from oven and allow to sit for 2-3 minutes.
Gently slide a knife around the edge of each cake to help release the cake from the ramekin. Carefully turn the molten cake onto a plate.
Serve warm as is, or with a dusting of powdered sugar on top. Berries and whipped cream would work well too.