Preheat oven to 350 degrees Fahrenheit. Grease or line 12 muffin tins.

Prepare the muffin batter: In a mixing bowl, lightly beat eggs, oil, and sugar by hand.

Add remaining ingredients; mix until smooth.

Spoon batter into prepared muffin tins. Bake 10 minutes, until a crust begins to form.

Meanwhile, prepare yogurt topping: In a small bowl, mix ingredients until smooth.

Indenting the center of the muffins slightly, spoon a dollop of topping into the center of each muffin.

Bake 15 more minutes.