Ensure to preheat the oven to 350 degrees Fahrenheit. After that, take your cupcake pans. And line them with cupcakes liners. Then, set aside your cupcake pans.

In a large mixing bowl, put the vanilla cake mix, pudding mix, strawberry Greek yogurt, and oil. In addition to that, add water, eggs, and vanilla. Then, mix and combine all the ingredients using your electric mixer fitted with a paddle attachment. After that, beat at medium speed for about two minutes until well combined. Afterward, fold in the fresh diced strawberries using a rubber spatula.

Using an ice cream scooper, divide the cupcake batter between twenty-four cupcake liners in the cupcake pans. Then, use about three tablespoons of batter per cupcake liner.

After that, bake your strawberry cupcakes inside the oven for about eighteen to twenty-two minutes or until cooked. With that, check it by using a toothpick or by gently pressing the cupcakes. If the cupcakes spring back without leaving a dent, the cupcakes cook thoroughly.

Once the strawberry cupcakes cook entirely, take them out of the oven. And allow them to rest inside the cupcake pans for about ten minutes. If the cupcakes have a slight depression in the center when cooled, do not worry.

Then, remove the strawberry cupcakes from the cupcake pans. After that, transfer them to the cooling wire rack to cool completely. Lastly, set aside your cupcakes and work on your frosting.

Before anything else, cream your butter using an electric mixer fitted with a paddle attachment. Then, set your electric mixer at medium-high speed. After that, beat your butter for about three minutes. Or beat it until it becomes lighter in color.

Afterward, put your electric mixer to low speed. And gradually add the powdered sugar until the sugar incorporates entirely with the butter. Then, add the vanilla extract and three tablespoons of strawberry puree. Because of this, mix until the mixture combines completely.

Then, turn off your electric mixer. And ensure to check the taste and texture of your strawberry buttercream. After that, you can add more strawberry puree if you want more strawberry flavor. For that reason, please remember that your buttercream frosting may result in a thinner frosting. It usually happens if you add more puree than in the recommended amount. Also, please turn on your electric mixer, set it to medium-high speed. And beat the mixture for approximately three to four minutes. Or beat it until the buttercream mixture becomes light and fluffy.

Finally, scrape the bowl and place your strawberry buttercream frosting inside a piping bag with a closed star piping tip.