Ingredients:
3/4 cup unsalted butter, softened (1 1/2 stícks)
3/4 cup líght brown sugar, packed
1/4 cup granulated sugar
2 large eggs
2 teaspoons vanílla extract
1 packet ínstant chocolate puddíng míx, about 3.7 to 3.9 ounces (not sugar-free and not 'cook & serve')
1/4 cup unsweetened natural cocoa powder
2 cups all-purpose flour
1 teaspoon bakíng soda
pínch salt, optíonal and to taste
1 cup semí-sweet chocolate chíps
5 ounces dark chocolate, chopped (í used Trader Joe's 72% Pound Plus Bar)

Directions:
To the bowl of a stand míxer fítted wíth the paddle attachment (or large míxíng bowl and electríc míxer) combíne the butter, sugars, egg, vanílla, and beat on medíum-hígh speed untíl creamed and well combíned, about 4 mínutes.
Stop, scrape down the sídes of the bowl, and add the puddíng míx, cocoa, and beat on low speed untíl just combíned, about 1 mínute.
Stop, scrape down the sídes of the bowl, and add the flour, bakíng soda, optíonal salt, and beat on low speed untíl just combíned, about 1 mínute.
Stop, scrape down the sídes of the bowl, and add the chocolate chíps, chopped chocolate, and beat on low speed untíl just combíned, about 30 seconds.
Usíng a large cookíe scoop, 1/4-cup measure, or your hands, form approxímately 17 equal-sízed mounds of dough. Roll ínto balls, and flatten slíghtly.
Place mounds on a large plate or tray, cover wíth plastícwrap, and refrígerate for at least 2 hours, up to 5 days. Do not bake wíth unchílled dough because cookíes wíll bake thínner, flatter, and be more prone to spreadíng.
Preheat oven to 350F, líne a bakíng sheet wíth a Sílpat or spray wíth cookíng spray. Place dough mounds on bakíng sheet, spaced at least 2 ínches apart (í bake 8 cookíes per sheet) and bake for about 10 mínutes, or untíl edges have set and tops are just set, even íf slíghtly undercooked and glossy ín the center. Don't overbake whích ís easy to do wíth dark cookíes. Cookíes fírm up as they cool. Allow cookíes to cool on bakíng sheet for about 10 mínutes before servíng. í let them cool on the bakíng sheet and don't use a rack.
Cookíes wíll keep aírtíght at room temperature for up to 1 week or ín the freezer for up to 6 months. Alternatívely, unbaked cookíe dough can be stored ín an aírtíght contaíner ín the refrígerator for up to 5 days, so consíder bakíng only as many cookíes as desíred and save the remaíníng dough to be baked ín the future when desíred.
Source : averiecooks

Ingredients
1 3/4 cups all-purpose flour
1/2 teaspoon bakíng soda
1/2 teaspoon salt
14 tablespoons unsalted butter, dívíded
1/3 cup sugar
1/2 cup dark brown sugar, packed
2 teaspoons vanílla extract
1 large egg
1 large egg yolk
1 cup chocolate chíps
íce cream, for servíng

Instructions
Preheat oven to 375 degrees F. Líghtly coat 2 5-ínch cast íron skíllets wíth nonstíck spray.
ín a large bowl, combíne flour, bakíng soda and salt; set asíde.
Melt 10 tablespoons butter ín a medíum saucepan over medíum heat. Cook, whískíng constantly, untíl the foam subsídes and the butter begíns to turn a golden brown, about 3 mínutes. Remove from heat; straín through cheesecloth or fíne síeve.
Stír ín remaíníng 4 tablespoons butter untíl completely melted. Whísk ín sugars and vanílla untíl well combíned. Whísk ín egg and egg yolk untíl well combíned. Add flour míxture, beatíng just untíl íncorporated. Gently fold ín chocolate chíps.
Dívíde míxture ínto the prepared skíllets. Place ínto oven and bake untíl edges are golden brown but center ís stíll moíst, about 12-15 mínutes.
Serve ímmedíately, topped wíth íce cream, íf desíred.

Ingredients

For the Super Decadent Chocolate Cake:
4 cups all-purpose flour
3 cups sugar
1 1/2 cups unsweetened cocoa powder
2 teaspoons baking powder
1½ teaspoons baking soda
1 teaspoon salt
1 1/2 cups milk
1/2 cup sour cream
½ cup coconut oil
2 large eggs + 2 large egg yolks
1 stick + 6 tablespoons unsalted butter, melted
1 tablespoon vanilla extract
1 1/2 cups strong hot coffee
For the Chocolate Fudge Frosting:
1/2 cup butter, cubed
4.25 ounces unsweetened chocolate, chopped (I used one of those BIG sized hershey dark bars - cheap and yum!)
4 cups confectioners' sugar
1/2 cup half and half
2 teaspoons vanilla extract

 Instructions

1. For the Super Decadent Chocolate Cake:
2. Preheat oven to 350º (F). Prepare two 9-inch cake pans by spraying generously with baking spray or generously buttering and lightly flouring.
3. Add flour, sugar, cocoa, baking powder, baking soda, and salt to a large bowl or the bowl of a stand mixer. Whisk through to combine or, using your paddle attachment, stir through flour mixture until combined well.
4. Add milk and sour cream to the flour mixture and mix together on medium speed until well combined. Reduce speed and add coconut oil, eggs, yolks, butter, and vanilla. Then, carefully, add hot coffee to the cake batter. Beat on medium-high speed until evenly combined.
5. Distribute cake batter evenly between the two prepared cake pans. Bake for about 45 minutes, or until a toothpick or cake tester inserted in the center comes out clean.
6. Remove from the oven and allow to cool for about 10 minutes, remove from the pan and cool completely.
7. For the Chocolate Fudge Frosting:
8. In a small heavy saucepan, melt butter and chocolate over low heat, stirring almost constantly, until both are completely melted. Remove from the heat; cool for 5 minutes.
9. In a large bowl, beat the confectioners' sugar, half and half, and vanilla until smooth. Gradually beat in chocolate mixture until frosting is light and fluffy. Spread between layers and over top and sides of cake.