Meringue cookies are always beautiful bites of air, but they aren't known for having much flavor aside from a smidge of vanilla. Sunbutter adds that missing flavor.
Combine egg whites and cream of tartar in a clean, dry bowl.
Beat at medium-high speed with heavy-duty stand mixer (or at high speed with a handheld mixer) until egg whites are creamy white instead of translucent and hold a soft shape when the beaters are lifted.
Continue to beat on medium-high speed, adding sugar a little at a time, taking 1 1/2 to 2 minutes in all, until whites are very stiff.
Scatter small spoonfuls of SunButter over meringue.
With large rubber spatula, fold SunButter into meringue; it's OK if it’s not perfectly blended.
Drop rounded tablespoons of meringue 1 1/2 inches apart onto lined cookie sheets. (Or use a pastry bag fitted with 1/2 inch or larger plain or star tip to pipe any size and shape you like.)
Sprinkle each meringue with a few sunflower seeds.
Bake for 1 1/2 hours. Rotate pans from top to bottom and from front to back halfway through baking time to ensure even baking.
Remove a test meringue and let cool completely before taking a bite. (Meringues are never crisp when hot.) If meringue is completely dry and crisp, turn off heat and let remaining meringues cool completely in oven. If test meringue is soft or chewy or sticks to your teeth, bake for another 15 to 20 minutes before testing another meringue.
To prevent the cookies from becoming moist and sticky, put them in an airtight container as soon as they are cool. They may be stored in an airtight container for at least 2 weeks.