Chocolate Chip Muffins

Chocolate Chip Muffins:
1/2 cup (113 grams) unsalted butter, melted and cooled
2 large eggs
1 cup (240 ml) milk or cream
1 1/2 teaspoons pure vanilla extract
2 cups (260 grams) all-purposeflour
2/3 cups (135 grams) granulated whitesugar
1 tablespoonbaking powder
1/2 teaspoon salt
1 cup (170 grams) milk chocolate or semisweet chocolate chips
Topping:
1 tablespoon (15 grams) granulated white sugar
1/2 teaspoon ground cinnamon