Melt the butter and stir in the neutral oil. Set aside to cool slightly.
In a large mixing bowl, whisk together the sour cream, milk, eggs, sugar, almond extract, vanilla extract, melted butter, and oil until smooth and well combined.
Whisk in the poppy seeds and let the mixture sit for 5 to 10 minutes to give the poppy seeds a chance to hydrate.
Add the baking powder, baking soda, and salt and whisk until evenly incorporated.
Immediately add the flour and use a rubber spatula to fold everything together just until the last streaks of flour disappear. Do not overmix.
Let the batter rest for 15 minutes. While the batter rests, preheat the oven to 425°F.
Line all 12 wells of a standard muffin pan with paper liners and lightly spritz the liners with nonstick cooking spray.
Divide the batter evenly between the 12 muffin wells.
If desired, sprinkle each muffin with coarse sparkling sugar and chopped raw sliced almonds.
Bake at 425°F for 5 minutes.
Without opening the oven door, reduce the temperature to 350°F and continue baking for 15 to 18 minutes, or until the tops spring back lightly when touched and a toothpick inserted into the center comes out clean or with a few moist crumbs.
Let the muffins cool in the pan for 5 minutes, then carefully transfer them to a wire rack to cool for at least 10 minutes longer.