I made these for the first time because I had a half-eaten baguette going stale on the counter and a can of cannellini beans I kept ignoring. That’s pretty much the whole origin story. What I didn’t expect was how much I’d actually want to eat them, standing over the pan before they even made it to a plate.
The setup is simple. You roast a few garlic cloves right in the toaster oven, smash them into warm brown-buttered white beans with lemon and rosemary, and pile the whole thing onto toasted baguette slices. Fifteen minutes of mostly hands-off time, one small pan. If you’ve got a toaster oven baking sheet that fits your machine, it makes toasting the crostini a lot easier — no balancing acts on the wire rack.
The brown butter is the thing that makes this feel a little more considered than it has any right to. It takes maybe two extra minutes and the difference is real. Nutty, rich, slightly caramel-y. It makes canned beans taste like something you’d order at a restaurant and quietly wonder about. I add red pepper flakes almost every time, but my husband skips them — totally your call.
This works great as an appetizer, a light lunch, or just something to eat while you figure out dinner. If you’re new to cooking in a compact countertop oven, having a reliable toaster oven with consistent temperature control makes recipes like this a lot more predictable. A lot of cheaper models run 25°F hotter than they say, so just watch your bread.
Toaster Oven Crispy Brown Butter Roasted Garlic and White Bean Crostini with Lemon and Rosemary
Thick slices of baguette toasted until golden, topped with creamy smashed white beans seasoned with roasted garlic, lemon zest, and fresh rosemary. Simple, fast, and genuinely satisfying.
Ingredients
Crostini
White Bean Topping
Optional Garnishes
Instructions
Roast the Garlic
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Preheat your toaster oven to 400°F. Place the 4 unpeeled garlic cloves on a small piece of foil, drizzle with a little olive oil, and wrap them up into a loose packet. Roast for 15 minutes, until the cloves feel soft when you press them. Set aside to cool slightly.
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Once cool enough to handle, squeeze the roasted garlic out of the skins into a small bowl. It should be soft and golden and smell incredible. Smash it into a rough paste with a fork.
Toast the Crostini
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While the garlic is roasting, brush both sides of each baguette slice with olive oil — about 2 tablespoons total. Arrange them on your toaster oven baking rack or a small sheet pan.
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Toast at 400°F for 6 to 8 minutes, flipping once halfway through, until they're deeply golden and crisp on the outside. Keep an eye on them. Toaster ovens vary wildly, and the difference between golden and burned is maybe 90 seconds.
Make the White Bean Topping
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Melt the butter in a small skillet over medium heat on your stovetop. Keep cooking it past the foamy stage — another 2 minutes or so — until it smells nutty and turns a light amber color. Brown butter sounds fancier than it is. Just don't walk away from it.
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Add the drained white beans to the pan. Stir to coat them in the butter and cook for about 2 minutes. They'll start to get a little color on some of them, which is exactly what you want.
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Add the roasted garlic paste, lemon juice, lemon zest, rosemary, red pepper flakes, salt, and black pepper. Stir everything together and cook for another minute. Turn off the heat.
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Using a fork or the back of a spoon, roughly smash about half the beans directly in the pan. You want it chunky — not hummus, not whole beans. Somewhere messy in between. Taste and adjust salt or lemon if needed.
Assemble
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Spoon the warm bean mixture generously onto each crostino. Don't be shy with it. Finish with flaky sea salt, a little fresh parsley if you have it, and a drizzle of your best olive oil. Serve immediately while the bread is still crisp.
Notes
Day-old baguette actually toasts better here — it's drier and gets crispier without going soft in the middle. If your toaster oven runs hot (mine definitely does), check the crostini at 5 minutes. The bean topping can be made a day ahead and refrigerated; just reheat it gently in a pan with a splash of water to loosen it up before topping. Leftovers are honestly great smeared cold on toast the next morning. Don't skip the lemon zest — it does a lot of work.
Nutrition
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Written by
Emma is a home cook who loves coaxing big flavor out of a toaster oven — from crispy roasted vegetables to easy weeknight dinners and sweet treats. She develops and tests Toastera's recipes for small-appliance kitchens.
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