Preheat your oven to 350°F (175°C). Line your 8x8-inch baking pan with parchment paper or lightly grease it with butter to prevent sticking.
In a medium saucepan or microwave-safe bowl, melt 1 cup of unsalted butter until fully liquid. Pour the melted butter into a large mixing bowl, then add 2 cups granulated sugar. Stir to combine until the mixture is smooth and glossy.
Beat in 4 large eggs, one at a time, making sure each egg is fully incorporated before adding the next. Once combined, stir in 2 teaspoons of vanilla extract for that warm, inviting aroma.
In a separate bowl, whisk together 1 cup all-purpose flour, 3/4 cup unsweetened cocoa powder, 1 teaspoon baking powder, and 1/2 teaspoon salt. This ensures an even distribution of leavening and flavor.
Gradually add the dry ingredients to the wet mixture, folding gently with a spatula until just combined. Avoid overmixing to keep the brownies tender and fudgy.
Stir in 1 cup chopped pecans and 1 cup chocolate chips, folding carefully to evenly distribute without deflating the batter.
Pour the batter into your prepared baking pan, spreading it evenly. Drizzle 1 cup of caramel sauce over the top. Using a knife or skewer, gently swirl the caramel into the batter to create a marbled effect.
Bake in your preheated oven for 30 to 35 minutes. The edges should be set, and a toothpick inserted into the center will come out with a few moist crumbs. Avoid overbaking to maintain that fudgy texture.
Allow the brownies to cool completely in the pan on a wire rack. Once cooled, lift them out using the parchment paper and cut into squares. Enjoy these decadent Chocolate Pecan Turtle Brownies with a glass of milk or your favorite hot beverage.