Triple Chocolate Muffins

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Ingredients

one 4-ounce bar (113g) semi-sweet chocolate*
1/2 cup (8 Tbsp; 113g) unsalted butter
3/4 cup (150g) granulated sugar
2 large eggs, at room temperature
1 teaspoon pure vanilla extract
1/3 cup (80g) sour cream or plain yogurt, at room temperature
1/2 cup (63g) all-purpose flour (spooned & leveled)
1/3 cup (27g) unsweetened natural cocoa powder*
1/2 teaspoon baking soda
1/4 teaspoon salt
1 heaping cup (180-200g) semi-sweet or dark chocolate chips (mini size works too!)

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