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1
Preheat oven to 325 F degrees.
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2
Set oven rack in middle of oven.
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3
Lightly spray 9x13 glass baking pan with cooking spray.
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4
In medium bowl, whisk together flour, cocoa powder, and baking powder (about 30 seconds).
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5
Set aside.
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6
In large bowl, whisk together sugar, milk, yogurt, vanilla, and melted chocolate until combined (about 1 minute).
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7
Add dry ingredients and whisk until just moistened, about 30-40 seconds.
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8
Pour batter into baking dish.
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9
Smooth the top with the back of a spoon.
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10
Set aside.
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11
Make the sauce: In medium bowl, whisk together the sugar, brown sugar, and cocoa.
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12
Gradually add the hot water, whisking until the sugar is dissolved and the sauce is smooth (about 30 seconds).
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13
Gently drizzle sauce over the back of a spoon onto the cake batter, covering the batter completely.
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14
NOTE: Don't worry if some of the batter floats up from below.
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15
Bake about 50 minutes, or until cake is firm to the touch.
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16
Allow to cool slightly, about 30 minutes.
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17
Release sides of cake by running a knife around the edges of the pan.
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18
Transfer squares to serving plates and spoon fudge sauce from the bottom of the pan over each piece.
