Give me a 5 minute chocolate pudding recipe that has 2/3 a cup of sugar, 1/4 a cup of cocoa powder, and no cornstarch.

Here is a quick and delicious 5-minute chocolate pudding recipe that uses 2/3 cup of sugar, 1/4 cup of cocoa powder, and no cornstarch:

Ingredients:
- 2/3 cup granulated sugar
- 1/4 cup unsweetened cocoa powder
- 3 tablespoons all-purpose flour
- 1/4 teaspoon salt
- 2 3/4 cups milk
- 2 large egg yolks
- 2 tablespoons butter
- 1 teaspoon vanilla extract

Instructions:
1. In a medium saucepan, mix together the sugar, cocoa powder, flour, and salt until well combined.
2. Gradually whisk in the milk until smooth and well-blended.
3. Turn on the heat to medium-high and cook the mixture, stirring constantly, until it begins to thicken and comes to a gentle boil. This should take about 3-4 minutes.
4. In a separate bowl, whisk the egg yolks until smooth.
5. Gradually pour about 1 cup of the hot milk mixture into the egg yolks, whisking constantly, to temper the eggs and prevent them from curdling.
6. Pour the tempered egg mixture back into the saucepan with the remaining milk mixture. Stir well to combine.
7. Continue cooking over medium heat, stirring constantly, until the pudding thickens to a pudding-like consistency. This should take about 1-2 minutes.
8. Remove the saucepan from the heat and stir in the butter and vanilla extract until fully melted and incorporated.
9. Pour the pudding into serving bowls or glasses. You can serve it warm immediately or refrigerate for a few hours until chilled and set.
10. If desired, you can also place a piece of plastic wrap directly on the surface of the pudding to prevent a skin from forming.
11. Serve the chocolate pudding plain or with whipped cream, fresh fruits, or any other toppings of your choice.

Enjoy your homemade chocolate pudding!