Orange Poppy Seed Cake with Mascarpone Frosting

Tender Orange Poppy Seed Cake layers with a delicious mascarpone frosting.

Every time I make a cheese based frosting, I swear it will be my last. They are SO difficult to work with. I know I could make them more stable, but I’d have to either add more cheese or more sugar — neither of which I want to do. So I’m stuck with a delicious tasting but less stable frosting. It is what it is.

Honestly, the only reason I keep making them is because they taste so good. Not too cheesy, not too sweet, and they complement certain cakes just perfectly. Like this Orange Poppy Seed Cake!

I’ve had a lemon poppy seed cake on my radar for a while now. I have a Lemon Poppy Seed Bundt (which was delicious), but I’d been meaning to make it into a layer cake for some time. Alas, it got pushed off yet again because I thought orange poppy seed would be a more interesting and unique flavour to try. If you’d rather do lemon, you can swap it in easy enough.

What kind of oranges should I use?

I am not an expert on oranges. I’ve currently been eating my way through bags of flavourful mandarins, but otherwise oranges are never a staple around here. If you’re an orange expert and have a favourite, go with what you love. Otherwise, good old navel oranges will work. Blood orange would work well too! I used Cava Cava Navel. 

Tips for Making this Orange Poppy Seed Cake

It’s a bit harder to get orange flavour to come through than lemon — it’s less potent overall. You could use an extract, but if you know me at all you know I prefer to use natural flavours when possible, and only use an extract when there’s really no other option. The key to getting that orange flavour to shine through is in the zest. Never skip the zest!

There is so much flavour packed in the zest, and my favourite way to extract it is to beat the zest with the butter and sugar. Processing it this way helps to extract the oils from the zest and get that flavour to come through. Don’t just toss the zest in at the end!

By the way, if you’re looking for a good zester, the one from Microplane are my absolute favourite. You get a superfine zest without any of the pith. Works like a charm every time.

For the poppy seeds, I toss them with my flour mixture. I find this is easiest, and there is less risk of over-mixing the batter rather than if you were to add them at the end.

Mascarpone Frosting

This mascarpone frosting goes so well with this orange poppy seed cake! It’s subtle and not overpowering like a cream cheese frosting can be, but it gives it a unique and delicious flavour. I won’t bore you with the details about how annoying the frosting was to work with — the naked cake I ended up going with should be an indication of how things went (lol).

I intended to fully frost this cake and do something rustic with the sides, but that was a total fail. The frosting was both soft and full of air bubbles, and all attempts to make an “easy” rustic swirl were futile. I ended up scraping the whole thing off and letting the pretty poppy seed studded sides shine through.

The frosting recipe makes enough to cover the whole cake though, and I’d recommend doing that because it’s so delicious. Maybe you’ll have better luck decorating than I did?

Styling inspo for this cake came from the lovely MaryAnne over at Little Epicurean. Can I just say how happy I was to find mandarin oranges with the leaves still attached?! Non-shrivelled leaves at that. 

This cake did not last long around here. I had to stop myself from inhaling an entire slice as I was cleaning the kitchen afterwards. Have I mentioned I have a weakness for citrus desserts?? I hope you love this cake recipe as much as I do!

Looking for more Citrus Cakes?

• Lemon Elderflower Cake
• Lemon Blueberry Cake
• Lime & Coconut Cake
• Key Lime Pie Cake
• Cranberry Orange Cake

Tips for making this Orange Poppy Seed Cake

• The recipe will also work in three 6″ pans. The layers will be slightly thicker than in the recipe above though, so you’ll need to increase the baking time.
• To make cupcakes, all you need to do is reduce the baking time — start checking at 15mins or so.
• The frosting recipe makes enough to fully frost the whole cake. 
• Do NOT overmix the frosting once the mascarpone is added. It could split.
• To make a lemon poppy seed cake instead, just swap orange for lemon in the same amounts.
• If you prefer, you can use a cream cheese frosting instead.
• To help ensure your cake layers bake up nice and flat, check out my Flat Top Cakes post!

5 from 2 votes

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Orange Poppy Seed Cake with Mascarpone Buttercream

Tender Orange Poppy Seed Cake layers with a delicious mascarpone frosting.

Course Dessert

Type Cake

Keyword orange poppy seed

Prep Time 2 hours

Cook Time 30 minutes

Total Time 2 hours 30 minutes

Servings 12

Calories 770 kcal

Author Olivia

INGREDIENTS

Orange Poppy Seed Cake:

• 2 1/4 cups all-purpose flour
• 2 1/4 tsp baking powder
• 1/2 tsp salt
• 2 Tbsp poppy seeds
• 3/4 cup unsalted butter room temperature
• 1 1/2 cup granulated sugar
• 1 1/2 Tbsp orange zest from 1-2 large oranges
• 3 large eggs room temperature
• 1 tsp vanilla
• 3/4 cup milk room temperature
• 1/4 cup orange juice fresh squeezed, from 1/2 a large orange

Mascarpone Buttercream:

• 1 1/2 cups unsalted butter room temperature
• 8 oz mascarpone cheese room temperature, 250g container
• 4 cups powdered sugar sifted
• 1 tsp vanilla

Assembly:

• simple syrup optional
• orange slices optional
• orange leaves optional
• poppy seeds optional

US Customary - Metric

INSTRUCTIONS

Orange Poppy Seed Cake:

1. Preheat oven to 350F. Grease and flour two 8" cake rounds and line with parchment.

2. In a medium bowl, whisk flour, baking powder, poppy seeds, and salt. Set aside.

3. Using a stand mixer fitted with a paddle attachment, cream butter, sugar and orange zest on med-high until pale and fluffy (about 3mins). Reduce speed and add eggs one at a time fully incorporating after each addition. Add vanilla.

4. Alternate adding flour mixture and milk & orange juice, beginning and ending with flour (3 additions of flour and 2 of milk & orange juice). Fully incorporating after each addition.

5. Bake for 25-30 mins or until a toothpick inserted into the center comes out mostly clean.

6. Place cakes on wire rack to cool for 10mins then turn out onto wire rack to cool completely.

Mascarpone Buttercream:

1. Beat butter until smooth. Slowly add in powdered sugar (1/2 cup at a time). Add vanilla and beat on med-high for 5mins.
   

2. Add mascarpone cheese and beat just until smooth and combined. Do not overbeat.
   

Assembly:

1. Place one layer of cake on a cake stand or serving plate. Drizzle with simple syrup if desired. Top with approximately 1 cup of buttercream, spread evenly. 

2. Repeat with remaining layer and apply a thin layer of frosting all over to crumb coat the cake. Chill for 20mins. You can leave the cake naked or fully frost the cake after chilling if desired.
   

3. Decorate the top with fresh orange slices, orange leaves, and poppy seeds if desired.

The nutritional information and metric conversions are calculated automatically. I cannot guarantee the accuracy of this data. If this important to you, please verify with your favourite nutrition calculator and/or metric conversion tool.