Heat the olive oil and butter in a large skillet over medium heat until butter is melted and bubbly.
Add the sliced onion and cook until golden and soft—about 5 minutes. Stir occasionally and try not to burn them like I sometimes do when I'm multitasking.
Toss in the sausage rounds and let them brown, flipping now and then so everyone gets crispy.
Add the frozen perogies straight to the pan. Don't thaw—just toss 'em in frozen and trust the process.
Cook everything together, flipping perogies occasionally, for another 10–12 minutes until the perogies are golden and cooked through.
Season with salt and pepper. Top with herbs if you’re feeling extra.
Serve warm and pretend you spent hours on it.