Heat oven to 425 degrees. Melt butter and oil in a skillet; add onions and garlic. Saute over medium-high heat for about 5 minutes, stirring frequently, or until onions are golden and translucent; remove from heat and set aside.
Line a nonstick jelly roll pan (15-by-10-by-1/4-inch) with the pizza crust dough, patting down evenly to edges of pan. Spread onion mixture evenly over surface, leaving about ½-inch around the edges. Sprinkle evenly with poppy seeds. Bake until dough is a nice golden brown, about 18-20 minutes, watching carefully. Cut into desired size slices. (I cut into 20 small slices) Serve hot.
Recipe by The Culinary Cellar at https://theculinarycellar.com/easy-onion-poppy-seed-flat-bread/