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1
Preheat the oven to 350 degrees F. Grease an 8-by-8-inch baking pan (a square pan will result in thicker brownies).
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2
In a medium-large saucepan, melt the butter with the chocolate over low heat, whisking occasionally until smooth and melted.
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3
Sprinkle in the cocoa powder and whisk to combine.
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4
Allow to cool for about 10 minutes.
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5
Stir in the granulated sugar and vanilla until just combined.
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6
Stir in the eggs.
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7
Gently stir in the flour until halfway incorporated.
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8
Pour the batter (it will be very thick!)
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9
into the prepared pan.
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10
Place the dulce de leche in a glass bowl.
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11
Warm it in the microwave for 30 to 45 seconds.
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12
Drop large dollops of dulce de leche on the surface of the brownie batter.
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13
Use a knife to slowly swirl it through the batter.
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14
Don't drag the knife sideways through the batter; hold it so the thin side of the knife leads the way.
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15
Bake for 40 minutes, then check the brownies with a toothpick.
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16
If they are overly gooey/messy, return to the oven for 5 to 10 more minutes (just be careful not to burn the edges).
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17
Allow to cool completely (important!
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18
), then sprinkle with powdered sugar and cut into small squares.
