In a large bowl, combine 1-1/2 cups flour, sugar, yeast, and salt.
In a small saucepan, heat the sour cream, water, and 2 tablespoons butter to 120-130°F; add to dry ingredients.
Beat on medium speed for 2 minutes. Add egg and 1/2 cup flour; beat 2 minutes longer. Stir in enough remaining flour to form a soft dough.
Turn onto a floured surface; knead until smooth and elastic, about 6-8 minutes. (I used my stand mixer with the dough hook attachment.)
Place in a greased bowl, turning once to grease the top. Cover and let rise in a warm place until doubled, about 1 hour.
Punch dough down. Turn onto a lightly floured surface; divide into 24 pieces. Shape each into a smooth oval. Try to make one side slightly thinner for the head. Taking a pair of kitchen shears, make two cuts on the top of the dough to form ears. Place bunnies on a baking sheet lined with parchment paper.
Cover and let rise until doubled, about 30 minutes.
Bake at 375° for about 10 minutes or until golden brown.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.